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JEE Main · Chemistry · 2021

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1
[JEE Main 2021, 1 September Shift 2, Q39] Monomer units of Dacron polymer are :
Not attempted
A
ethylene glycol and phthalic acid
B
ethylene glycol and terephthalic acid
C
glycerol and terephthalic acid
D
glycerol and phthalic acid
2
[JEE Main 2021, 1 September Shift 2, Q60] A peptide synthesized by the reactions of one molecule each of Glycine, Leucine, Aspartic acid and Histidine will have ________ peptide linkages.
Not attempted
Your answer: —
Correct answer: 3
3
[JEE Main 2021, 1 September Shift 2, Q35] Identify A in the following reaction.
Not attempted
K2Cr2O7A
A
Structure (1)
B
Structure (2)
C
Structure (3)
D
Structure (4)
4
[JEE Main 2021, 1 September Shift 2, Q46] Which one of the following gives the most stable Diazonium salt ?
Not attempted
A
CH3−CH2−CH2−NH2\mathrm{CH_3-CH_2-CH_2-NH_2}
B
p-Toluidine (4-methylaniline)
C
CH3−CH(CH3)−NH2\mathrm{CH_3-CH(CH_3)-NH_2} (isopropylamine)
D
N-Methylaniline
5
[JEE Main 2021, 1 September Shift 2, Q36] In the following sequence of reactions a compound A, (molecular formula C6H12O2\mathrm{C_6H_{12}O_2}) with a straight chain structure gives a C4\mathrm{C_4} carboxylic acid. A is : A→H3O+LiAlH4B→OxidationC4-carboxylic acid\mathrm{A}\xrightarrow[\mathrm{H_3O^+}]{\mathrm{LiAlH_4}}\mathrm{B}\xrightarrow{\text{Oxidation}}\mathrm{C_4}\text{-carboxylic acid}
Not attempted
A
CH3−CH2−COO−CH2−CH2−CH3\mathrm{CH_3-CH_2-COO-CH_2-CH_2-CH_3}
B
CH3−CH2−CH(OH)−CH2−O−CH=CH2\mathrm{CH_3-CH_2-CH(OH)-CH_2-O-CH=CH_2}
C
CH3−CH2−CH2−COO−CH2−CH3\mathrm{CH_3-CH_2-CH_2-COO-CH_2-CH_3}
D
CH3−CH2−CH2−O−CH=CH−CH2−OH\mathrm{CH_3-CH_2-CH_2-O-CH=CH-CH_2-OH}
6
[JEE Main 2021, 1 September Shift 2, Q45] Given below are two statements : Statement I : The nucleophilic addition of sodium hydrogen sulphite to an aldehyde or a ketone involves proton transfer to form a stable ion. Statement II : The nucleophilic addition of hydrogen cyanide to an aldehyde or a ketone yields amine as final product. In the light of the above statements, choose the most appropriate answer from the options given below :
Not attempted
A
Both Statement I and Statement II are true.
B
Statement I is true but Statement II is false.
C
Statement I is false but Statement II is true.
D
Both Statement I and Statement II are false.
7
[JEE Main 2021, 1 September Shift 2, Q44] In the following sequence of reactions, C3H6→H+/H2OA→dil KOHKIOB+C\mathrm{C_3H_6}\xrightarrow{\mathrm{H^+/H_2O}}\mathrm{A}\xrightarrow[\text{dil KOH}]{\mathrm{KIO}}\mathrm{B}+\mathrm{C} The compounds B and C respectively are :
Not attempted
A
CI3COOK, HCOOH\mathrm{CI_3COOK},\ \mathrm{HCOOH}
B
CI3COOK, CH3I\mathrm{CI_3COOK},\ \mathrm{CH_3I}
C
CH3I, HCOOK\mathrm{CH_3I},\ \mathrm{HCOOK}
D
CHI3, CH3COOK\mathrm{CHI_3},\ \mathrm{CH_3COOK}
8
[JEE Main 2021, 1 September Shift 2, Q38] The Crystal Field Stabilization Energy (CFSE) and magnetic moment (spin-only) of an octahedral aqua complex of a metal ion (Mz+\mathrm{M^{z+}}) are −0.8 Δ0-0.8\ \Delta_0 and 3.873.87 BM, respectively. Identify (Mz+\mathrm{M^{z+}}) :
Not attempted
A
V3+\mathrm{V^{3+}}
B
Cr3+\mathrm{Cr^{3+}}
C
Mn4+\mathrm{Mn^{4+}}
D
Co2+\mathrm{Co^{2+}}
9
[JEE Main 2021, 1 September Shift 2, Q54] The sum of oxidation states of two silver ions in [Ag(NH3)2][Ag(CN)2][\mathrm{Ag(NH_3)_2}][\mathrm{Ag(CN)_2}] complex is _______.
Not attempted
Your answer: —
Correct answer: 2
10
[JEE Main 2021, 1 September Shift 2, Q41] In the given chemical reaction, colors of the Fe2+\mathrm{Fe^{2+}} and Fe3+\mathrm{Fe^{3+}} ions, are respectively : 5Fe2++MnO4−+8H+→Mn2++4H2O+5Fe3+5\mathrm{Fe^{2+}}+\mathrm{MnO_4^-}+8\mathrm{H^+}\rightarrow \mathrm{Mn^{2+}}+4\mathrm{H_2O}+5\mathrm{Fe^{3+}}
Not attempted
A
Yellow, Orange
B
Yellow, Green
C
Green, Orange
D
Green, Yellow
11
[JEE Main 2021, 1 September Shift 2, Q47] The potassium ferrocyanide solution gives a Prussian blue colour, when added to :
Not attempted
A
CoCl3\mathrm{CoCl_3}
B
FeCl2\mathrm{FeCl_2}
C
CoCl2\mathrm{CoCl_2}
D
FeCl3\mathrm{FeCl_3}
12
[JEE Main 2021, 1 September Shift 2, Q50] Identify the element for which electronic configuration in +3+3 oxidation state is [Ar]3d5[\mathrm{Ar}]3d^5 :
Not attempted
A
Ru
B
Mn
C
Co
D
Fe
13
[JEE Main 2021, 1 September Shift 2, Q32] Calamine and Malachite, respectively, are the ores of :
Not attempted
A
Nickel and Aluminium
B
Zinc and Copper
C
Copper and Iron
D
Aluminium and Zinc
14
[JEE Main 2021, 1 September Shift 2, Q37] Match List - I with List - II. List-I (Colloid Preparation Method)List-II (Chemical Reaction)(a) Hydrolysis(i) 2AuCl3+3HCHO+3H2O→2Au(sol)+3HCOOH+6HCl(b) Reduction(ii) As2O3+3H2S→As2S3(sol)+3H2O(c) Oxidation(iii) SO2+2H2S→3S(sol)+2H2O(d) Double Decomposition(iv) FeCl3+3H2O→Fe(OH)3(sol)+3HCl\begin{array}{|l|l|}\hline \textbf{List-I (Colloid Preparation Method)} & \textbf{List-II (Chemical Reaction)} \\\hline \text{(a) Hydrolysis} & \text{(i) } 2\mathrm{AuCl_3}+3\mathrm{HCHO}+3\mathrm{H_2O}\rightarrow 2\mathrm{Au(sol)}+3\mathrm{HCOOH}+6\mathrm{HCl} \\\hline \text{(b) Reduction} & \text{(ii) } \mathrm{As_2O_3}+3\mathrm{H_2S}\rightarrow \mathrm{As_2S_3(sol)}+3\mathrm{H_2O} \\\hline \text{(c) Oxidation} & \text{(iii) } \mathrm{SO_2}+2\mathrm{H_2S}\rightarrow 3\mathrm{S(sol)}+2\mathrm{H_2O} \\\hline \text{(d) Double Decomposition} & \text{(iv) } \mathrm{FeCl_3}+3\mathrm{H_2O}\rightarrow \mathrm{Fe(OH)_3(sol)}+3\mathrm{HCl} \\\hline\end{array} Choose the most appropriate answer from the options given below.
Not attempted
A
(a)-(i), (b)-(iii), (c)-(ii), (d)-(iv)
B
(a)-(iv), (b)-(i), (c)-(iii), (d)-(ii)
C
(a)-(iv), (b)-(ii), (c)-(iii), (d)-(i)
D
(a)-(i), (b)-(ii), (c)-(iv), (d)-(iii)
15
[JEE Main 2021, 1 September Shift 2, Q34] Which one of the following given graphs represents the variation of rate constant (kk) with temperature (TT) for an endothermic reaction ?
Not attempted
A
Graph (1)
kT
B
Graph (2)
kT
C
Graph (3)
kT
D
Graph (4)
kT
16
[JEE Main 2021, 1 September Shift 2, Q59] If the conductivity of mercury at 0∘C0^\circ\mathrm{C} is 1.07×106 S m−11.07\times10^{6}\ \mathrm{S\,m^{-1}} and the resistance of a cell containing mercury is 0.243 Ω0.243\ \Omega, then the cell constant of the cell is x×104 m−1x\times10^{4}\ \mathrm{m^{-1}}. The value of xx is _______. (Nearest integer)
Not attempted
Your answer: —
Correct answer: 26
17
[JEE Main 2021, 1 September Shift 2, Q31] Water sample is called cleanest on the basis of which one of the BOD values given below
Not attempted
A
11 ppm
B
15 ppm
C
3 ppm
D
21 ppm
18
[JEE Main 2021, 1 September Shift 2, Q42] The stereoisomers that are formed by electrophilic addition of bromine to trans-but-2-ene is/are :
Not attempted
A
2 enantiomers and 2 mesomers
B
2 identical mesomers
C
2 enantiomers
D
1 racemic and 2 enantiomers
19
[JEE Main 2021, 1 September Shift 2, Q33] Experimentally reducing a functional group cannot be done by which one of the following reagents ?
Not attempted
A
Pt-C/H2\mathrm{Pt\text{-}C/H_2}
B
Na/H2\mathrm{Na/H_2}
C
Pd-C/H2\mathrm{Pd\text{-}C/H_2}
D
Zn/H2O\mathrm{Zn/H_2O}
20
[JEE Main 2021, 1 September Shift 2, Q48] The oxide without nitrogen-nitrogen bond is :
Not attempted
A
N2O\mathrm{N_2O}
B
N2O4\mathrm{N_2O_4}
C
N2O3\mathrm{N_2O_3}
D
N2O5\mathrm{N_2O_5}
21
[JEE Main 2021, 1 September Shift 2, Q49] Number of paramagnetic oxides among the following given oxides is __________. Li2O, CaO, Na2O2, KO2, MgO and K2O\mathrm{Li_2O,\ CaO,\ Na_2O_2,\ KO_2,\ MgO\ and\ K_2O}
Not attempted
A
1
B
2
C
3
D
0
22
[JEE Main 2021, 1 September Shift 2, Q43] Hydrogen peroxide reacts with iodine in basic medium to give :
Not attempted
A
IO4−\mathrm{IO_4^-}
B
IO−\mathrm{IO^-}
C
I−\mathrm{I^-}
D
IO3−\mathrm{IO_3^-}
23
[JEE Main 2021, 1 September Shift 2, Q52] The molar solubility of Zn(OH)2\mathrm{Zn(OH)_2} in 0.10.1 M NaOH solution is x×10−18x\times10^{-18} M. The value of xx is _____ (Nearest integer) (Given : The solubility product of Zn(OH)2\mathrm{Zn(OH)_2} is 2×10−202\times10^{-20})
Not attempted
Your answer: —
Correct answer: 2
24
[JEE Main 2021, 1 September Shift 2, Q53] For the reaction 2NO2(g)⇌N2O4(g)2\mathrm{NO_2(g)}\rightleftharpoons \mathrm{N_2O_4(g)}, when ΔS=−176.0 J K−1\Delta S=-176.0\ \mathrm{J\,K^{-1}} and ΔH=−57.8 kJ mol−1\Delta H=-57.8\ \mathrm{kJ\,mol^{-1}}, the magnitude of ΔG\Delta G at 298298 K for the reaction is _____ kJ mol−1\mathrm{kJ\,mol^{-1}}. (Nearest integer)
Not attempted
Your answer: —
Correct answer: 5
25
[JEE Main 2021, 1 September Shift 2, Q51] An empty LPG cylinder weighs 14.814.8 kg. When full, it weighs 29.029.0 kg and shows a pressure of 3.473.47 atm. In the course of use at ambient temperature, the mass of the cylinder is reduced to 23.023.0 kg. The final pressure inside of the cylinder is ______ atm. (Nearest integer) (Assume LPG to be an ideal gas)
Not attempted
Your answer: —
Correct answer: 2
26
[JEE Main 2021, 1 September Shift 2, Q58] The spin-only magnetic moment value of B2+\mathrm{B_2^+} species is ________×10−2\times10^{-2} BM. (Nearest integer) [Given : 3=1.73\sqrt3=1.73]
Not attempted
Your answer: —
Correct answer: 173
27
[JEE Main 2021, 1 September Shift 2, Q57] A 5050 watt bulb emits monochromatic red light of wavelength of 795795 nm. The number of photons emitted per second by the bulb is x×1020x\times10^{20}. The value of xx is _________. [Given : h=6.63×10−34h=6.63\times10^{-34} Js and c=3.0×108 ms−1c=3.0\times10^{8}\ \mathrm{ms^{-1}}]
Not attempted
Your answer: —
Correct answer: 2
28
[JEE Main 2021, 1 September Shift 2, Q55] The number of atoms in 88 g of sodium is x×1023x\times10^{23}. The value of xx is ________. (Nearest integer) [Given : NA=6.02×1023 mol−1N_A=6.02\times10^{23}\ \mathrm{mol^{-1}}; Atomic mass of Na =23.0=23.0 u]
Not attempted
Your answer: —
Correct answer: 2
29
[JEE Main 2021, 1 September Shift 2, Q56] If 8080 g of copper sulphate CuSO4⋅5H2O\mathrm{CuSO_4\cdot5H_2O} is dissolved in deionised water to make 55 L of solution. The concentration of the copper sulphate solution is x×10−3 mol L−1x\times10^{-3}\ \mathrm{mol\,L^{-1}}. The value of xx is _________. [Atomic masses Cu : 63.5463.54 u, S : 3232 u, O : 1616 u, H : 11 u]
Not attempted
Your answer: —
Correct answer: 64
30
[JEE Main 2021, 31 August Shift 2, Q44] Which among the following is not a polyester ?
Not attempted
A
Novolac
B
PHBV
C
Dacron
D
Glyptal
31
[JEE Main 2021, 31 August Shift 2, Q37] Which of the following is NOT an example of fibrous protein ?
Not attempted
A
Keratin
B
Albumin
C
Collagen
D
Myosin
32
[JEE Main 2021, 31 August Shift 2, Q36] The major products AA and BB formed in the following reaction sequence are : (aniline is treated with acetic anhydride to give AA, which on treatment with Br2Br_2, CH3COOHCH_3COOH at room temperature gives BB)
Not attempted
+ ABr2​, CH3​COOHRoom temperatureB
A
AA = N-phenylacetamide, BB = N-(3-bromophenyl)acetamide
A = B =
B
AA = N-phenylacetamide, BB = N-(4-bromophenyl)acetamide
A = B =
C
AA = 4-aminoacetophenone, BB = 2-bromo-4-acetylaniline
A = B =
D
AA = 4-aminoacetophenone, BB = 2,6-dibromo-4-acetylaniline
A = B =
33
[JEE Main 2021, 31 August Shift 2, Q39] For the reaction given below : 4-(hydroxymethyl)benzaldehyde (HOCH2−C6H4−CHOHOCH_2-C_6H_4-CHO, para) → 2. H3O+ 1. NaOH, Δ\xrightarrow[\ 2.\ H_3O^+\ ]{1.\ NaOH,\ \Delta} Product The compound which is NOT formed as a product in the reaction is a :
Not attempted
1. NaOH, Δ2. H3​O+​Product
A
compound with both alcohol and acid functional groups
B
monocarboxylic acid
C
dicarboxylic acid
D
diol
34
[JEE Main 2021, 31 August Shift 2, Q47] The major product of the following reaction is : (3-chloro-4-methylcyclopentene, i.e. a cyclopentene carrying ClCl on the allylic carbon and CH3CH_3 on the adjacent carbon, is treated with NaOHNaOH in C2H5OHC_2H_5OH; the substrate is shown in the figure)
Not attempted
NaOHC2​H5​OHMajor product
A
4-methylcyclopent-2-en-1-ol (substitution with allylic shift)
B
1-methylcyclopent-3-en-1-ol
C
5-methylcyclopent-2-en-1-ol (direct substitution of ClCl by OHOH, the double bond unchanged)
D
1-methylcyclopenta-1,3-diene (elimination of HCl)
35
[JEE Main 2021, 31 August Shift 2, Q48] For the following : benzene → 3. CH3OH 1. Br2/Fe/Δ  2. Mg/dry ether\xrightarrow[\ 3.\ CH_3OH\ ]{1.\ Br_2/Fe/\Delta\ \ 2.\ Mg/dry\ ether} Products
Not attempted
2. Mg / dry ether1. Br2​ / Fe / Δ3. CH3​OHProducts
A
anisole + HMgBr+\ HMgBr
+ HMgBr
B
benzene + Mg(OCH3)Br+\ Mg(OCH_3)Br
+ Mg(OCH3​)Br
C
toluene + Mg(OH)Br+\ Mg(OH)Br
+ Mg(OH)Br
D
bromobenzene + HMg(OCH3)+\ HMg(OCH_3)
+ HMg(OCH3​)
36
[JEE Main 2021, 31 August Shift 2, Q40] Spin only magnetic moment in BM of [Fe(CO)4(C2O4)]+[Fe(CO)_4(C_2O_4)]^+ is :
Not attempted
A
5.925.92
B
00
C
11
D
1.731.73
37
[JEE Main 2021, 31 August Shift 2, Q32] The Eu2+Eu^{2+} ion is a strong reducing agent in spite of its ground state electronic configuration (outermost) : [Atomic number of Eu = 63]
Not attempted
A
4f76s24f^{7}6s^{2}
B
4f64f^{6}
C
4f74f^{7}
D
4f66s24f^{6}6s^{2}
38
[JEE Main 2021, 31 August Shift 2, Q46] Match List-I with List-II : List-I (Metal Ion)List-II (Group in Qualitative analysis)(a)Mn2+(i) Group - III(b)As3+(ii) Group - IIA(c)Cu2+(iii) Group - IV(d)Al3+(iv) Group - IIB\displaystyle\begin{array}{lll} & \textbf{List-I (Metal Ion)} & \textbf{List-II (Group in Qualitative analysis)} \\ \text{(a)} & Mn^{2+} & \text{(i)}\ \text{Group - III} \\ \text{(b)} & As^{3+} & \text{(ii)}\ \text{Group - IIA} \\ \text{(c)} & Cu^{2+} & \text{(iii)}\ \text{Group - IV} \\ \text{(d)} & Al^{3+} & \text{(iv)}\ \text{Group - IIB} \end{array} Choose the most appropriate answer from the options given below :
Not attempted
A
(a)-(i), (b)-(ii), (c)-(iii), (d)-(iv)
B
(a)-(iii), (b)-(iv), (c)-(ii), (d)-(i)
C
(a)-(i), (b)-(iv), (c)-(ii), (d)-(iii)
D
(a)-(iv), (b)-(ii), (c)-(iii), (d)-(i)
39
[JEE Main 2021, 31 August Shift 2, Q55] In the electrolytic refining of blister copper, the total number of main impurities, from the following, removed as anode mud is ________ : Pb, Sb, Se, Te, Ru, Ag, AuPb,\ Sb,\ Se,\ Te,\ Ru,\ Ag,\ Au and PtPt
Not attempted
Your answer: —
Correct answer: 6
40
[JEE Main 2021, 31 August Shift 2, Q51] CH4CH_4 is adsorbed on 1 g charcoal at 0∘C0^{\circ}C following the Freundlich adsorption isotherm. 10.0 mL of CH4CH_4 is adsorbed at 100 mm of Hg, whereas 15.0 mL is adsorbed at 200 mm of Hg. The volume of CH4CH_4 adsorbed at 300 mm of Hg is 10x10^{x} mL. The value of xx is _______ ×10−2\times10^{-2}. (Nearest integer) [Use log⁡102=0.3010\log_{10}2=0.3010, log⁡103=0.4771\log_{10}3=0.4771]
Not attempted
Your answer: —
Correct answer: 128
41
[JEE Main 2021, 31 August Shift 2, Q57] For the reaction A→BA\rightarrow B, the rate constant kk (in s−1^{-1}) is given by log⁡10k=20.35−(2.47×103)T\log_{10}k=20.35-\dfrac{(2.47\times10^{3})}{T}. The energy of activation in kJ mol−1^{-1} is _______. (Nearest integer) [Given : R=8.314R=8.314 J K−1^{-1} mol−1^{-1}]
Not attempted
Your answer: —
Correct answer: 47
42
[JEE Main 2021, 31 August Shift 2, Q35] Match List-I with List-II List-I (Parameter)List-II (Unit)(a)Cell constant(i) S cm2 mol−1(b)Molar conductivity(ii) Dimensionless(c)Conductivity(iii) m−1(d)Degree of dissociation of electrolyte(iv) Ω−1m−1\displaystyle\begin{array}{lll} & \textbf{List-I (Parameter)} & \textbf{List-II (Unit)} \\ \text{(a)} & \text{Cell constant} & \text{(i)}\ S\ cm^2\ mol^{-1} \\ \text{(b)} & \text{Molar conductivity} & \text{(ii)}\ \text{Dimensionless} \\ \text{(c)} & \text{Conductivity} & \text{(iii)}\ m^{-1} \\ \text{(d)} & \text{Degree of dissociation of electrolyte} & \text{(iv)}\ \Omega^{-1}m^{-1} \end{array} Choose the most appropriate answer from the options given below :
Not attempted
A
(a)-(iii), (b)-(i), (c)-(iv), (d)-(ii)
B
(a)-(iii), (b)-(i), (c)-(ii), (d)-(iv)
C
(a)-(i), (b)-(iv), (c)-(iii), (d)-(ii)
D
(a)-(ii), (b)-(i), (c)-(iii), (d)-(iv)
43
[JEE Main 2021, 31 August Shift 2, Q52] 1.22 g of an organic acid is separately dissolved in 100 g of benzene (Kb=2.6K_b=2.6 K kg mol−1^{-1}) and 100 g of acetone (Kb=1.7K_b=1.7 K kg mol−1^{-1}). The acid is known to dimerize in benzene but remain as a monomer in acetone. The boiling point of the solution in acetone increases by 0.17∘C0.17^{\circ}C. The increase in boiling point of solution in benzene in ∘C^{\circ}C is x×10−2x\times10^{-2}. The value of xx is _______. (Nearest integer) [Atomic mass : C = 12.0, H = 1.0, O = 16.0]
Not attempted
Your answer: —
Correct answer: 13
44
[JEE Main 2021, 31 August Shift 2, Q54] The empirical formula for a compound with a cubic close packed arrangement of anions and with cations occupying all the octahedral sites in AxBA_xB. The value of xx is _________ (Integer answer)
Not attempted
Your answer: —
Correct answer: 1
45
[JEE Main 2021, 31 August Shift 2, Q38] The deposition of XX and YY on ground surfaces is referred as wet and dry depositions, respectively. XX and YY are :
Not attempted
A
XX = Ammonium salts, YY = CO2CO_2
B
XX = SO2SO_2, YY = Ammonium salts
C
XX = Ammonium salts, YY = SO2SO_2
D
XX = CO2CO_2, YY = SO2SO_2
46
[JEE Main 2021, 31 August Shift 2, Q31] Arrange the following conformational isomers of n-butane in order of their increasing potential energy : (the four Newman projections I, II, III and IV are shown in the figure)
Not attempted
HHCH3CH3HHICH3HHCH3HHIICH3HHCH3HHIIIHH3CHHHCH3IV
A
II < III < IV < I
B
I < IV < III < II
C
II < IV < III < I
D
I < III < IV < II
47
[JEE Main 2021, 31 August Shift 2, Q33] The structures of AA and BB formed in the following reaction are : [Ph=−C6H5][Ph=-C_6H_5] (benzene reacts with succinic anhydride in the presence of AlCl3AlCl_3 (2 eq) to give AA, which on treatment with Zn/HgZn/Hg, HClHCl gives BB)
Not attempted
+ AlCl3​ (2 eq)AZn/HgHClB
A
AA = 4-oxo-4-phenylbutanoic acid, BB = 4-phenylbutanoic acid
A = B =
B
AA = 1-phenylpropan-1-one, BB = 1-phenylpropan-1-ol
A = B =
C
AA = 4-oxo-4-phenylbutanoic acid, BB = 4-phenylbutan-1-ol
A = B =
D
AA = 1-phenylpropan-1-one, BB = propylbenzene
A = B =
48
[JEE Main 2021, 31 August Shift 2, Q49] Identify correct AA, BB and CC in the reaction sequence given below : benzene →Δconc. HNO3 + conc. H2SO4A→Anhyd. AlCl3Cl2B→Fe/HClC\xrightarrow[\Delta]{conc.\ HNO_3\ +\ conc.\ H_2SO_4}A\xrightarrow[Anhyd.\ AlCl_3]{Cl_2}B\xrightarrow{Fe/HCl}C
Not attempted
+ conc. H2​SO4​conc. HNO3​ΔACl2​Anhyd. AlCl3​BFe / HClC
A
AA = nitrobenzene, BB = 3-chloronitrobenzene, CC = 3-chloroaniline
A = B = C =
B
AA = nitrobenzene, BB = 3-chloronitrobenzene, CC = 3-chlorophenol
A = B = C =
C
AA = nitrobenzene, BB = 4-chloronitrobenzene, CC = 4-chloroaniline
A = B = C =
D
AA = nitrobenzene, BB = 3-chloronitrobenzene, CC = 3-aminophenol
A = B = C =
49
[JEE Main 2021, 31 August Shift 2, Q60] The transformation occurring in Duma's method is given below : C2H7N+(2x+y2)CuO→xCO2+y2H2O+z2N2+(2x+y2)CuC_2H_7N+\left(2x+\dfrac{y}{2}\right)CuO\rightarrow xCO_2+\dfrac{y}{2}H_2O+\dfrac{z}{2}N_2+\left(2x+\dfrac{y}{2}\right)Cu. The value of yy is ________. (Integer answer)
Not attempted
Your answer: —
Correct answer: 7
50
[JEE Main 2021, 31 August Shift 2, Q45] Which one of the following correctly represents the order of stability of oxides, X2OX_2O; (XX = halogen) ?
Not attempted
A
Br > Cl > I
B
Br > I > Cl
C
Cl > I > Br
D
I > Cl > Br
51
[JEE Main 2021, 31 August Shift 2, Q50] The number of S=OS=O bonds present in sulphurous acid, peroxodisulphuric acid and pyrosulphuric acid, respectively are :
Not attempted
A
2, 3 and 4
B
1, 4 and 3
C
2, 4 and 3
D
1, 4 and 4
52
[JEE Main 2021, 31 August Shift 2, Q41] Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason (R). Assertion (A) : Lithium salts are hydrated. Reason (R) : Lithium has higher polarising power than other alkali metal group members. In the light of the above statements, choose the most appropriate answer from the options given below :
Not attempted
A
Both (A) and (R) are correct but (R) is NOT the correct explanation of (A).
B
(A) is correct but (R) is not correct.
C
(A) is not correct but (R) is correct.
D
Both (A) and (R) are correct and (R) is the correct explanation of (A).
53
[JEE Main 2021, 31 August Shift 2, Q43] Which one of the following statements is incorrect ?
Not attempted
A
Atomic hydrogen is produced when H2H_2 molecules at a high temperature are irradiated with UV radiation.
B
At around 2000 K, the dissociation of dihydrogen into its atoms is nearly 8.1%.
C
Bond dissociation enthalpy of H2H_2 is highest among diatomic gaseous molecules which contain a single bond.
D
Dihydrogen is produced on reacting zinc with HCl as well as NaOH(aq)NaOH_{(aq)}.
54
[JEE Main 2021, 31 August Shift 2, Q56] The pHpH of a solution obtained by mixing 50 mL of 1 M HClHCl and 30 mL of 1 M NaOHNaOH is x×10−4x\times10^{-4}. The value of xx is __________. (Nearest integer) [log⁡2.5=0.3979\log2.5=0.3979]
Not attempted
Your answer: —
Correct answer: 6021
55
[JEE Main 2021, 31 August Shift 2, Q42] The incorrect expression among the following is :
Not attempted
A
ΔGsystemΔSTotal=−T\dfrac{\Delta G_{system}}{\Delta S_{Total}}=-T (at constant PP)
B
ln⁡K=ΔH∘−TΔS∘RT\ln K=\dfrac{\Delta H^{\circ}-T\Delta S^{\circ}}{RT}
C
K=e−ΔG∘/RTK=e^{-\Delta G^{\circ}/RT}
D
For isothermal process wreversible=−nRTln⁡VfViw_{reversible}=-nRT\ln\dfrac{V_f}{V_i}
56
[JEE Main 2021, 31 August Shift 2, Q59] According to molecular orbital theory, the number of unpaired electron(s) in O22−O_2^{2-} is _________.
Not attempted
Your answer: —
Correct answer: 0
57
[JEE Main 2021, 31 August Shift 2, Q53] The value of magnetic quantum number of the outermost electron of Zn+Zn^{+} ion is _________.
Not attempted
Your answer: —
Correct answer: 0
58
[JEE Main 2021, 31 August Shift 2, Q58] Sodium oxide reacts with water to produce sodium hydroxide. 20.0 g of sodium oxide is dissolved in 500 mL of water. Neglecting the change in volume, the concentration of the resulting NaOHNaOH solution is ____________ ×10−1\times10^{-1} M. (Nearest integer) [Atomic mass : Na = 23.0, O = 16.0, H = 1.0]
Not attempted
Your answer: —
Correct answer: 13
59
[JEE Main 2021, 31 August Shift 1, Q40] Monomer of Novolac is :
Not attempted
A
3-Hydroxybutanoic acid
B
phenol and melamine
C
o-Hydroxymethylphenol
D
1,3-Butadiene and styrene
60
[JEE Main 2021, 31 August Shift 1, Q35] Which one of the following compounds contains β-C1-C4\beta\text{-}C_1\text{-}C_4 glycosidic linkage ?
Not attempted
A
Lactose
B
Sucrose
C
Maltose
D
Amylose
61
[JEE Main 2021, 31 August Shift 1, Q36] The major products A and B in the following set of reactions are : A← H3O+ LiAlH4 (CH3)2C(OH)CN → H2SO4 H3O+ BA\xleftarrow[\ H_3O^+\ ]{LiAlH_4}\ (CH_3)_2C(OH)CN\ \xrightarrow[\ H_2SO_4\ ]{H_3O^+}\ B (the cyanohydrin is shown in the figure)
Not attempted
A
A=(CH3)2C(OH)CH2OHA=(CH_3)_2C(OH)CH_2OH, B=(CH3)2C(OH)CHOB=(CH_3)_2C(OH)CHO
A B
B
A=(CH3)2C(OH)CHOA=(CH_3)_2C(OH)CHO, B=(CH3)2C(OH)CO2HB=(CH_3)_2C(OH)CO_2H
A B
C
A=(CH3)2C(OH)CH2NH2A=(CH_3)_2C(OH)CH_2NH_2, B=CH2=C(CH3)COOHB=CH_2=C(CH_3)COOH
A B
D
A=(CH3)2C(OH)CH2NH2A=(CH_3)_2C(OH)CH_2NH_2, B=(CH3)2C(OH)CHOB=(CH_3)_2C(OH)CHO
A B
62
[JEE Main 2021, 31 August Shift 1, Q54] The total number of reagents from those given below, that can convert nitrobenzene into aniline is ______. (Integer answer) I. Sn−HClSn-HCl II. Sn−NH4OHSn-NH_4OH III. Fe−HClFe-HCl IV. Zn−HClZn-HCl V. H2−PdH_2-Pd VI. H2−H_2-Raney Nickel
Not attempted
Your answer: —
Correct answer: 5
63
[JEE Main 2021, 31 August Shift 1, Q50] The structure of product C, formed by the following sequence of reactions is : CH3COOH+SOCl2⟶A→AlCl3BenzeneB→−OHKCNCCH_3COOH+SOCl_2\longrightarrow A\xrightarrow[AlCl_3]{Benzene}B\xrightarrow[-OH]{KCN}C
Not attempted
A
C6H5−C(OH)(CN)−CH3C_6H_5-C(OH)(CN)-CH_3 (the cyanohydrin of acetophenone)
B
2-Cyanoacetophenone (o-CH3CO−C6H4−CNCH_3CO-C_6H_4-CN)
C
2-Phenylpropanoic acid C6H5−CH(CH3)−COOHC_6H_5-CH(CH_3)-COOH
D
C6H5−CH2CH2−CNC_6H_5-CH_2CH_2-CN
64
[JEE Main 2021, 31 August Shift 1, Q39] The major product formed in the following reaction is : (CH3)3C−CH(OH)CH3 →a few dropsconc. H2SO4 Major product(CH_3)_3C-CH(OH)CH_3\ \xrightarrow[\text{a few drops}]{\text{conc. }H_2SO_4}\ \text{Major product} (the alcohol is shown in the figure)
Not attempted
A
CH3−C(CH3)=CH−CH2CH3CH_3-C(CH_3)=CH-CH_2CH_3
B
(CH3)2C=C(CH3)2(CH_3)_2C=C(CH_3)_2
C
(CH3)2C=CH−CH3(CH_3)_2C=CH-CH_3
D
(CH3)3C−CH=CH2(CH_3)_3C-CH=CH_2
65
[JEE Main 2021, 31 August Shift 1, Q31] The correct order of reactivity of the given chlorides with acetate in acetic acid is : (the four chlorides P, Q, R and S are shown in the figure)
Not attempted
P Q R S
A
P > Q > R > S
> > >
B
S > Q > P > R
> > >
C
P > S > R > Q
> > >
D
Q > P > S > R
> > >
66
[JEE Main 2021, 31 August Shift 1, Q43] The denticity of an organic ligand, biuret is :
Not attempted
A
2
B
4
C
3
D
6
67
[JEE Main 2021, 31 August Shift 1, Q34] In the structure of the dichromate ion, there is a :
Not attempted
A
linear symmetrical Cr-O-Cr bond.
B
non-linear symmetrical Cr-O-Cr bond.
C
linear unsymmetrical Cr-O-Cr bond.
D
non-linear unsymmetrical Cr-O-Cr bond.
68
[JEE Main 2021, 31 August Shift 1, Q37] Which one of the following lanthanides exhibits +2 oxidation state with diamagnetic nature ? (Given Z for Nd = 60, Yb = 70, La = 57, Ce = 58)
Not attempted
A
Nd
B
Yb
C
La
D
Ce
69
[JEE Main 2021, 31 August Shift 1, Q38] Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason (R). Assertion (A) : Aluminium is extracted from bauxite by the electrolysis of molten mixture of Al2O3Al_2O_3 with cryolite. Reason (R) : The oxidation state of Al in cryolite is +3. In the light of the above statements, choose the most appropriate answer from the options given below :
Not attempted
A
(A) is true but (R) is false
B
(A) is false but (R) is true.
C
Both (A) and (R) are correct and (R) is the correct explanation of (A)
D
Both (A) and (R) are correct but (R) is not the correct explanation of (A)
70
[JEE Main 2021, 31 August Shift 1, Q32] Select the graph that correctly describes the adsorption isotherms at two temperatures T1T_1 and T2T_2 (T1>T2T_1 > T_2) for a gas : (xx = mass of the gas adsorbed ; mm = mass of adsorbent ; PP = pressure)
Not attempted
A
Graph (1): straight lines through the origin, T2T_2 above T1T_1
Px/mT2T1
B
Graph (2): curves, T1T_1 above T2T_2
Px/mT1T2
C
Graph (3): straight lines through the origin, T1T_1 above T2T_2
Px/mT1T2
D
Graph (4): curves, T2T_2 above T1T_1
Px/mT2T1
71
[JEE Main 2021, 31 August Shift 1, Q56] For a first order reaction, the ratio of the time for 75\% completion of a reaction to the time for 50\% completion is _______. (Integer answer)
Not attempted
Your answer: —
Correct answer: 2
72
[JEE Main 2021, 31 August Shift 1, Q51] Consider the following cell reaction : Cd(s)+Hg2SO4(s)+95H2O(l)⇌CdSO4⋅95H2O(s)+2Hg(l)Cd_{(s)}+Hg_2SO_{4(s)}+\dfrac{9}{5}H_2O_{(l)}\rightleftharpoons CdSO_4\cdot\dfrac{9}{5}H_2O_{(s)}+2Hg_{(l)} The value of Ecell0E^0_{cell} is 4.315 V at 25∘^\circC. If ΔH∘=−825.2 kJ mol−1\Delta H^\circ=-825.2\ kJ\ mol^{-1}, the standard entropy change ΔS∘\Delta S^\circ in J K−1J\ K^{-1} is ______. (Nearest integer) [Given : Faraday constant = 96487 C mol−1^{-1}]
Not attempted
Your answer: —
Correct answer: 25
73
[JEE Main 2021, 31 August Shift 1, Q48] Which one of the following 0.10 M aqueous solutions will exhibit the largest freezing point depression ?
Not attempted
A
hydrazine
B
glucose
C
glycine
D
KHSO4KHSO_4
74
[JEE Main 2021, 31 August Shift 1, Q49] BOD values (in ppm) for clean water (A) and polluted water (B) are expected respectively as :
Not attempted
A
A > 50, B < 27
B
A > 25, B < 17
C
A < 5, B > 17
D
A > 15, B > 47
75
[JEE Main 2021, 31 August Shift 1, Q42] Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason (R). Assertion (A) : Treatment of bromine water with propene yields 1-bromopropan-2-ol. Reason (R) : Attack of water on bromonium ion follows Markovnikov rule and results in 1-bromopropan-2-ol. In the light of the above statements, choose the most appropriate answer from the options given below :
Not attempted
A
Both (A) and (R) are true but (R) is NOT the correct explanation of (A)
B
(A) is false but (R) is true.
C
Both (A) and (R) are true and (R) is the correct explanation of (A)
D
(A) is true but (R) is false
76
[JEE Main 2021, 31 August Shift 1, Q45] Choose the correct name for compound given below :
Not attempted
A
(4E)-5-Bromo-hex-4-en-2-yne
B
(2E)-2-Bromo-hex-4-yn-2-ene
C
(2E)-2-Bromo-hex-2-en-4-yne
D
(4E)-5-Bromo-hex-2-en-4-yne
77
[JEE Main 2021, 31 August Shift 1, Q47] Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason (R) : Assertion (A) : A simple distillation can be used to separate a mixture of propanol and propanone. Reason (R) : Two liquids with a difference of more than 20∘C20^\circ C in their boiling points can be separated by simple distillations. In the light of the above statements, choose the most appropriate answer from the options given below :
Not attempted
A
(A) is false but (R) is true.
B
Both (A) and (R) are correct but (R) is not the correct explanation of (A)
C
(A) is true but (R) is false
D
Both (A) and (R) are correct and (R) is the correct explanation of (A)
78
[JEE Main 2021, 31 August Shift 1, Q53] Consider the sulphides HgS, PbS, CuS, Sb2S3Sb_2S_3, As2S3As_2S_3 and CdS. Number of these sulphides soluble in 50\% HNO3HNO_3 is ________.
Not attempted
Your answer: —
Correct answer: 4
79
[JEE Main 2021, 31 August Shift 1, Q55] The number of halogen/(s) forming halic (V) acid is __________.
Not attempted
Your answer: —
Correct answer: 3
80
[JEE Main 2021, 31 August Shift 1, Q33] The major component/ingredient of Portland Cement is :
Not attempted
A
tricalcium aluminate
B
tricalcium silicate
C
dicalcium aluminate
D
dicalcium silicate
81
[JEE Main 2021, 31 August Shift 1, Q41] Given below are two statements : Statement-I : The process of producing syn-gas is called gasification of coal. Statement-II : The composition of syn-gas is CO+CO2+H2CO+CO_2+H_2 (1 : 1 : 1). In the light of the above statements, choose the most appropriate answer from the options given below :
Not attempted
A
Statement-I is false but Statement-II is true
B
Statement-I is true but Statement-II is false
C
Both Statement-I and Statement-II are false
D
Both Statement-I and Statement-II are true
82
[JEE Main 2021, 31 August Shift 1, Q57] The number of hydrogen bonded water molecule(s) associated with stoichiometry CuSO4⋅5H2OCuSO_4\cdot5H_2O is _______.
Not attempted
Your answer: —
Correct answer: 1
83
[JEE Main 2021, 31 August Shift 1, Q60] A3B2A_3B_2 is a sparingly soluble salt of molar mass MM (g mol−1^{-1}) and solubility xx g L−1^{-1}. The solubility product satisfies Ksp=a(xM)5K_{sp}=a\left(\dfrac{x}{M}\right)^5. The value of aa is ________. (Integer answer)
Not attempted
Your answer: —
Correct answer: 108
84
[JEE Main 2021, 31 August Shift 1, Q58] According to the following figure, the magnitude of the enthalpy change of the reaction A+B→M+NA+B\rightarrow M+N in kJ mol−1^{-1} is equal to __________. (Integer answer)
Not attempted
xyzA+BM+Nx = 20 kJ mol−1y = 45 kJ mol−1z = 15 kJ mol−1Reaction CoordinateEnergy
Your answer: —
Correct answer: 45
85
[JEE Main 2021, 31 August Shift 1, Q46] Which one of the following is the correct PVPV vs PP plot at constant temperature for an ideal gas ? (PP and VV stand for pressure and volume of the gas respectively)
Not attempted
A
Graph (1): horizontal straight line
PPV
B
Graph (2): decreasing curve (hyperbola)
PPV
C
Graph (3): straight line through the origin with positive slope
PPV
D
Graph (4): straight line with negative slope
PPV
86
[JEE Main 2021, 31 August Shift 1, Q44] Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason (R). Assertion (A) : Metallic character decreases and non-metallic character increases on moving from left to right in a period. Reason (R) : It is due to increase in ionisation enthalpy and decrease in electron gain enthalpy, when one moves from left to right in a period. In the light of the above statements, choose the most appropriate answer from the options given below :
Not attempted
A
(A) is false but (R) is true.
B
(A) is true but (R) is false
C
Both (A) and (R) are correct and (R) is the correct explanation of (A)
D
Both (A) and (R) are correct but (R) is not the correct explanation of (A)
87
[JEE Main 2021, 31 August Shift 1, Q59] Ge (Z = 32) in its ground state electronic configuration has xx completely filled orbitals with ml=0m_l=0. The value of xx is _______.
Not attempted
Your answer: —
Correct answer: 7
88
[JEE Main 2021, 31 August Shift 1, Q52] The molarity of the solution prepared by dissolving 6.3 g of oxalic acid (H2C2O4⋅2H2O)(H_2C_2O_4\cdot2H_2O) in 250 mL of water in mol L−1^{-1} is x×10−2x\times10^{-2}. The value of xx is ________. (Nearest integer) [Atomic mass : H : 1.0, C : 12.0, O : 16.0]
Not attempted
Your answer: —
Correct answer: 20
89
[JEE Main 2021, 27 August Shift 2, Q36] Which one of the following chemicals is responsible for the production of HCl in the stomach leading to irritation and pain? (Structures (1)-(4) are shown in the figures.)
Not attempted
A
Saccharin (structure 1)
B
Histamine (structure 2)
C
Serotonin (structure 3)
D
Phenelzine, a hydrazine derivative of phenethylamine (structure 4)
90
[JEE Main 2021, 27 August Shift 2, Q46] Which one of the following tests used for the identification of functional groups in organic compounds does not use copper reagent?
Not attempted
A
Barfoed's test
B
Seliwanoff's test
C
Benedict's test
D
Biuret test for peptide bond
91
[JEE Main 2021, 27 August Shift 2, Q47] Hydrolysis of sucrose gives :
Not attempted
A
α\alpha-D-(−)(-)-Glucose and β\beta-D-(−)(-)-Fructose
B
α\alpha-D-(+)(+)-Glucose and α\alpha-D-(−)(-)-Fructose
C
α\alpha-D-(−)(-)-Glucose and α\alpha-D-(+)(+)-Fructose
D
α\alpha-D-(+)(+)-Glucose and β\beta-D-(−)(-)-Fructose
92
[JEE Main 2021, 27 August Shift 2, Q50] The correct structures of A and B formed in the following reactions are : 4-nitrophenol→C2H5OHH2/PdA→(CH3CO)2O (1.0 eq.)B (major product)4\text{-nitrophenol}\xrightarrow[C_2H_5OH]{H_2/Pd}A\xrightarrow{(CH_3CO)_2O\ (1.0\ \text{eq.})}B\ \text{(major product)} (4-nitrophenol is shown in the figure; each option gives A and B.)
Not attempted
A
Structure (1): A = 4-aminophenol, B = 2-acetyl-4-aminophenol
B
Structure (2): A = 4-aminophenyl acetate, B = 4-acetamidophenyl acetate
C
Structure (3): A = 4-aminophenol, B = 4-aminophenyl acetate
D
Structure (4): A = 4-aminophenol, B = 4-hydroxyacetanilide (paracetamol)
93
[JEE Main 2021, 27 August Shift 2, Q38] Which one of the following reactions will not yield propionic acid?
Not attempted
A
CH3CH2COCH3+OI−/H3O+CH_3CH_2COCH_3+OI^-/H_3O^+
B
CH3CH2CH3+KMnO4(heat),OH−/H3O+CH_3CH_2CH_3+KMnO_4(\text{heat}),OH^-/H_3O^+
C
CH3CH2CCl3+OH−/H3O+CH_3CH_2CCl_3+OH^-/H_3O^+
D
CH3CH2CH2Br+Mg, CO2 (dry ether)/H3O+CH_3CH_2CH_2Br+Mg,\ CO_2\text{ (dry ether)}/H_3O^+
94
[JEE Main 2021, 27 August Shift 2, Q40] Which one of the following is the major product of the given reaction? (The starting ketone is shown in the figure.) ketone→(iii) H2SO4, heat(i) 2CH3MgBr; (ii) H3O+Major product\text{ketone}\xrightarrow[\text{(iii) }H_2SO_4,\ \text{heat}]{\text{(i) }2CH_3MgBr;\ \text{(ii) }H_3O^+}\text{Major product}
Not attempted
A
Structure (1): aryl methyl ketone with the C1=C2C_1=C_2 tetrasubstituted double bond
B
Structure (2): nitrile retained, C1=C2C_1=C_2 double bond
C
Structure (3): nitrile retained, C2=C3C_2=C_3 double bond
D
Structure (4): aryl methyl ketone with the C2=C3C_2=C_3 double bond
95
[JEE Main 2021, 27 August Shift 2, Q33] Given below are two statements : Statement I : Ethyl pent-4-yn-oate on reaction with CH3MgBrCH_3MgBr gives a 3∘3^\circ-alcohol. Statement II : In this reaction one mole of ethyl pent-4-yn-oate utilizes two moles of CH3MgBrCH_3MgBr. In the light of the above statements, choose the most appropriate answer from the options given below :
Not attempted
A
Both Statement I and Statement II are false.
B
Statement I is false but Statement II is true.
C
Statement I is true but Statement II is false.
D
Both Statement I and Statement II are true.
96
[JEE Main 2021, 27 August Shift 2, Q44] The major product of the following reaction, if it occurs by SN2S_N2 mechanism is : C6H5OH+(CH3)2C=CH−CH2−Br→acetoneK2CO3C_6H_5OH+(CH_3)_2C=CH-CH_2-Br\xrightarrow[\text{acetone}]{K_2CO_3} (the bromide is shown in the figure)
Not attempted
A
Structure (1): PhO−CH2CH2−C(CH3)2−OPhPhO-CH_2CH_2-C(CH_3)_2-OPh
B
Structure (2): PhO−C(CH3)2−CH=CH2PhO-C(CH_3)_2-CH=CH_2
C
Structure (3): PhO−CH2CH2−C(CH3)=CH2PhO-CH_2CH_2-C(CH_3)=CH_2
D
Structure (4): PhO−CH2−CH=C(CH3)2PhO-CH_2-CH=C(CH_3)_2
97
[JEE Main 2021, 27 August Shift 2, Q41] The major product (A) formed in the reaction given below is : CH3CH2CH(Ph)CH2Br+CH3O− →CH3OH ACH_3CH_2CH(Ph)CH_2Br+CH_3O^-\ \xrightarrow{CH_3OH}\ A (the substrate is shown in the figure; Ph = phenyl)
Not attempted
A
Structure (1): ring pp-methoxylated, −CH2Br-CH_2Br retained
B
Structure (2): CH3CH2C(Ph)=CH2CH_3CH_2C(Ph)=CH_2
C
Structure (3): CH3CH2CH(Ph)CH2OHCH_3CH_2CH(Ph)CH_2OH
D
Structure (4): CH3CH2CH(Ph)CH2OCH3CH_3CH_2CH(Ph)CH_2OCH_3
98
[JEE Main 2021, 27 August Shift 2, Q52] The number of optical isomers possible for [Cr(C2O4)3]3−[Cr(C_2O_4)_3]^{3-} is ______.
Not attempted
Your answer: —
Correct answer: 2
99
[JEE Main 2021, 27 August Shift 2, Q32] The addition of dilute NaOH to Cr3+Cr^{3+} salt solution will give :
Not attempted
A
a solution of [Cr(OH)4]−[Cr(OH)_4]^-
B
precipitate of Cr2O3(H2O)nCr_2O_3(H_2O)_n
C
precipitate of [Cr(OH)6]3−[Cr(OH)_6]^{3-}
D
precipitate of Cr(OH)3Cr(OH)_3
100
[JEE Main 2021, 27 August Shift 2, Q45] Potassium permanganate on heating at 513 K gives a product which is :
Not attempted
A
paramagnetic and colourless
B
diamagnetic and green
C
diamagnetic and colourless
D
paramagnetic and green
101
[JEE Main 2021, 27 August Shift 2, Q48] Match List-I with List-II : List-I (ore/mineral)List-II (formula)(a) Calamine(i) ZnS(b) Malachite(ii) FeCO3(c) Siderite(iii) ZnCO3(d) Sphalerite(iv) CuCO3⋅Cu(OH)2\displaystyle\begin{array}{|l|l|}\hline \textbf{List-I (ore/mineral)} & \textbf{List-II (formula)} \\\hline \text{(a) Calamine} & \text{(i) } ZnS \\ \text{(b) Malachite} & \text{(ii) } FeCO_3 \\ \text{(c) Siderite} & \text{(iii) } ZnCO_3 \\ \text{(d) Sphalerite} & \text{(iv) } CuCO_3\cdot Cu(OH)_2 \\\hline\end{array} Choose the most appropriate answer from the options given below :
Not attempted
A
(a)-(iii), (b)-(iv), (c)-(ii), (d)-(i)
B
(a)-(iii), (b)-(iv), (c)-(i), (d)-(ii)
C
(a)-(iv), (b)-(iii), (c)-(i), (d)-(ii)
D
(a)-(iii), (b)-(ii), (c)-(iv), (d)-(i)
102
[JEE Main 2021, 27 August Shift 2, Q43] Lyophilic sols are more stable than lyophobic sols because :
Not attempted
A
there is a strong electrostatic repulsion between the negatively charged colloidal particles.
B
the colloidal particles have positive charge.
C
the colloidal particles have no charge.
D
the colloidal particles are solvated.
103
[JEE Main 2021, 27 August Shift 2, Q51] The first order rate constant for the decomposition of CaCO3CaCO_3 at 700 K700\ K is 6.36×10−3 s−16.36\times10^{-3}\ s^{-1} and activation energy is 209 kJ mol−1209\ kJ\ mol^{-1}. Its rate constant (in s−1s^{-1}) at 600 K600\ K is x×10−6x\times10^{-6}. The value of xx is _______. (Nearest integer) [Given R=8.31 J K−1mol−1R=8.31\ J\ K^{-1}mol^{-1}; log⁡6.36×10−3=−2.19\log 6.36\times10^{-3}=-2.19, 10−4.79=1.62×10−510^{-4.79}=1.62\times10^{-5}]
Not attempted
Your answer: —
Correct answer: 16
104
[JEE Main 2021, 27 August Shift 2, Q56] The resistance of a conductivity cell with cell constant 1.14 cm−11.14\ cm^{-1}, containing 0.001 M0.001\ M KCl at 298 K298\ K is 1500 Ω1500\ \Omega. The molar conductivity of 0.001 M0.001\ M KCl solution at 298 K298\ K in S cm2 mol−1S\ cm^2\ mol^{-1} is_______. (Integer answer)
Not attempted
Your answer: —
Correct answer: 760
105
[JEE Main 2021, 27 August Shift 2, Q55] 40 g40\ g of glucose (molar mass =180=180) is mixed with 200 mL200\ mL of water. The freezing point of solution is _____ K. (Nearest integer) [Given : Kf=1.86 K kg mol−1K_f=1.86\ K\ kg\ mol^{-1}; density of water =1.00 g cm−3=1.00\ g\ cm^{-3}; freezing point of water =273.15 K=273.15\ K]
Not attempted
Your answer: —
Correct answer: 271
106
[JEE Main 2021, 27 August Shift 2, Q34] In stratosphere most of the ozone formation is assisted by :
Not attempted
A
cosmic rays.
B
γ\gamma-rays.
C
ultraviolet radiation.
D
visible radiations.
107
[JEE Main 2021, 27 August Shift 2, Q42] Which one of the following is used to remove most of plutonium from spent nuclear fuel?
Not attempted
A
ClF3ClF_3
B
O2F2O_2F_2
C
I2O5I_2O_5
D
BrO3BrO_3
108
[JEE Main 2021, 27 August Shift 2, Q49] Which one of the following is formed (mainly) when red phosphorus is heated in a sealed tube at 803 K?
Not attempted
A
White phosphorus
B
Yellow phosphorus
C
β\beta-Black phosphorus
D
α\alpha-Black phosphorus
109
[JEE Main 2021, 27 August Shift 2, Q31] Choose the correct statement from the following :
Not attempted
A
The standard enthalpy of formation for alkali metal bromides becomes less negative on descending the group.
B
The low solubility of CsI in water is due to its high lattice enthalpy.
C
Among the alkali metal halides, LiF is least soluble in water.
D
LiF has least negative standard enthalpy of formation among alkali metal fluorides.
110
[JEE Main 2021, 27 August Shift 2, Q37] The oxide that gives H2O2H_2O_2 most readily on treatment with H2OH_2O is :
Not attempted
A
PbO2PbO_2
B
Na2O2Na_2O_2
C
SnO2SnO_2
D
BaO2⋅8H2OBaO_2\cdot 8H_2O
111
[JEE Main 2021, 27 August Shift 2, Q58] When 5.1 g5.1\ g of solid NH4HSNH_4HS is introduced into a two litre evacuated flask at 27∘C27^\circ C, 20%20\% of the solid decomposes into gaseous ammonia and hydrogen sulphide. The KpK_p for the reaction at 27∘C27^\circ C is x×10−2x\times10^{-2}. The value of xx is _______. (Integer answer) [Given R=0.082 L atm K−1mol−1R=0.082\ L\ atm\ K^{-1}mol^{-1}]
Not attempted
Your answer: —
Correct answer: 6
112
[JEE Main 2021, 27 August Shift 2, Q60] Data given for the following reaction is as follows : FeO(s)+C(graphite)→Fe(s)+CO(g)FeO(s)+C(graphite)\rightarrow Fe(s)+CO(g) SubstanceΔH∘ (kJ mol−1)S∘ (J mol−1K−1)FeO(s)−266.357.49C(graphite)05.74Fe(s)027.28CO(g)−110.5197.6\displaystyle\begin{array}{|l|c|c|}\hline \text{Substance} & \Delta H^\circ\ (kJ\ mol^{-1}) & S^\circ\ (J\ mol^{-1}K^{-1}) \\\hline FeO(s) & -266.3 & 57.49 \\ C(graphite) & 0 & 5.74 \\ Fe(s) & 0 & 27.28 \\ CO(g) & -110.5 & 197.6 \\\hline\end{array} The minimum temperature in K at which the reaction becomes spontaneous is ________. (Integer answer)
Not attempted
Your answer: —
Correct answer: 964
113
[JEE Main 2021, 27 August Shift 2, Q53] Two flasks I and II shown below are connected by a valve of negligible volume. Flask I contains 2.8 g N22.8\ g\ N_2 at 300 K300\ K in 1 L1\ L and flask II contains 0.2 g N20.2\ g\ N_2 at 60 K60\ K in 2 L2\ L. When the valve is opened, the final pressure of the system in bar is x×10−2x\times10^{-2}. The value of xx is ______. (Integer answer) [Assume ideal gas; 1 bar=105 Pa1\ bar=10^5\ Pa; molar mass of N2=28.0 g mol−1N_2=28.0\ g\ mol^{-1}; R=8.31 J mol−1K−1R=8.31\ J\ mol^{-1}K^{-1}]
Not attempted
Your answer: —
Correct answer: 84
114
[JEE Main 2021, 27 August Shift 2, Q35] The compound/s which will show significant intermolecular H-bonding is/are : (a) 2-nitrophenol, (b) 4-hydroxyacetanilide (paracetamol), (c) 2,6-di-tert-butyl-4-methylphenol (all shown in the figure).
Not attempted
A
(b) only
B
(c) only
C
(a) and (b) only
D
(a), (b) and (c)
115
[JEE Main 2021, 27 August Shift 2, Q59] The number of species having non-pyramidal shape among the following is_______. (A) SO3SO_3 (B) NO3−NO_3^- (C) PCl3PCl_3 (D) CO32−CO_3^{2-}
Not attempted
Your answer: —
Correct answer: 3
116
[JEE Main 2021, 27 August Shift 2, Q39] The correct order of ionic radii for the ions, P3−P^{3-}, S2−S^{2-}, Ca2+Ca^{2+}, K+K^+, Cl−Cl^- is :
Not attempted
A
P3−>S2−>Cl−>K+>Ca2+P^{3-}>S^{2-}>Cl^->K^+>Ca^{2+}
B
Cl−>S2−>P3−>Ca2+>K+Cl^->S^{2-}>P^{3-}>Ca^{2+}>K^+
C
P3−>S2−>Cl−>Ca2+>K+P^{3-}>S^{2-}>Cl^->Ca^{2+}>K^+
D
K+>Ca2+>P3−>S2−>Cl−K^+>Ca^{2+}>P^{3-}>S^{2-}>Cl^-
117
[JEE Main 2021, 27 August Shift 2, Q57] The number of photons emitted by a monochromatic (single frequency) infrared range finder of power 1 mW1\ mW and wavelength of 1000 nm1000\ nm, in 0.10.1 second is x×1013x\times10^{13}. The value of xx is _____. (Nearest integer) (h=6.63×10−34 Jsh=6.63\times10^{-34}\ Js, c=3.00×108 ms−1c=3.00\times10^8\ ms^{-1})
Not attempted
Your answer: —
Correct answer: 50
118
[JEE Main 2021, 27 August Shift 2, Q54] 100 g100\ g of propane is completely reacted with 1000 g1000\ g of oxygen. The mole fraction of carbon dioxide in the resulting mixture is x×10−2x\times10^{-2}. The value of xx is ______. (Nearest integer) [Atomic weight : H=1.008H=1.008; C=12.00C=12.00; O=16.00O=16.00]
Not attempted
Your answer: —
Correct answer: 19
119
[JEE Main 2021, 27 August Shift 1, Q38] The structures (A), (B), (C) and (D) are shown in the figure. The correct statement about (A), (B), (C) and (D) is :
Not attempted
A
(A), (B) and (C) are narcotic analgesics
B
(B), (C) and (D) are tranquillizers
C
(A) and (D) are tranquillizers
D
(B) and (C) are tranquillizers
120
[JEE Main 2021, 27 August Shift 1, Q45] Out of following isomeric forms of uracil, which one is present in RNA ?
Not attempted
A
Dilactim form (2,4-dihydroxypyrimidine), structure (1)
B
Lactam-lactim form (4-hydroxy-2-oxo), structure (2)
C
Lactim-lactam form (2-hydroxy-4-oxo), structure (3)
D
Dilactam form (2,4-dioxo), structure (4)
121
[JEE Main 2021, 27 August Shift 1, Q39] The major product of the following reaction is : (CH3)2CH−CH2−CH2−COCl→(i) alcoholic NH3 (ii) NaOH, Br2 (iii) NaNO2, HCl (iv) H2O Major product(CH_3)_2CH-CH_2-CH_2-COCl\xrightarrow{\text{(i) alcoholic }NH_3\ \text{(ii) }NaOH,\ Br_2\ \text{(iii) }NaNO_2,\ HCl\ \text{(iv) }H_2O}\ \text{Major product}
Not attempted
A
(CH3)2CH−CHBr−CH2OH(CH_3)_2CH-CHBr-CH_2OH
B
(CH3)2CH−CH2−CH2−CH2OH(CH_3)_2CH-CH_2-CH_2-CH_2OH
C
(CH3)2CH−CH2−CH2OH(CH_3)_2CH-CH_2-CH_2OH
D
(CH3)2CH−CH2−CH2−Cl(CH_3)_2CH-CH_2-CH_2-Cl
122
[JEE Main 2021, 27 August Shift 1, Q40] Which of the following is not a correct statement for primary aliphatic amines?
Not attempted
A
The intermolecular association in primary amines is less than the intermolecular association in secondary amines.
B
Primary amines on treating with nitrous acid solution form corresponding alcohols except methyl amine.
C
Primary amines are less basic than the secondary amines.
D
Primary amines can be prepared by the Gabriel phthalimide synthesis.
123
[JEE Main 2021, 27 August Shift 1, Q32] The structure of the starting compound P used in the reaction given below is (the product, but-2-enoic acid, is shown in the figure) : P→  2. H3O+  1. NaOCl CH3CH=CHCOOH (figure)P\xrightarrow[\;2.\ H_3O^+\;]{1.\ NaOCl}\ \text{CH}_3\text{CH=CHCOOH (figure)}
Not attempted
A
3-Penten-2-one
B
Pent-2-enal
C
3,4-Dihydro-2H-pyran
D
Cyclopentanone
124
[JEE Main 2021, 27 August Shift 1, Q46] Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason (R). Assertion (A): Synthesis of ethyl phenyl ether may be achieved by Williamson synthesis. Reason (R): Reaction of bromobenzene with sodium ethoxide yields ethyl phenyl ether. In the light of the above statements, choose the most appropriate answer from the options given below :
Not attempted
A
Both (A) and (R) are correct and (R) is the correct explanation of (A)
B
(A) is correct but (R) is not correct
C
(A) is not correct but (R) is correct
D
Both (A) and (R) are correct but (R) is NOT the correct explanation of (A)
125
[JEE Main 2021, 27 August Shift 1, Q47] In the following sequence of reactions the P is : Chlorocyclopentane+Mg→etherdry[A]→ethanolP (Major Product)\text{Chlorocyclopentane}+Mg\xrightarrow[\text{ether}]{\text{dry}}[A]\xrightarrow{\text{ethanol}}P\ \text{(Major Product)}
Not attempted
A
Cyclopentane
B
Ethoxycyclopentane (cyclopentyl ethyl ether)
C
Ethylcyclopentane
D
Cyclopentene
126
[JEE Main 2021, 27 August Shift 1, Q41] Acidic ferric chloride solution on treatment with excess of potassium ferrocyanide gives a Prussian blue coloured colloidal species. It is :
Not attempted
A
Fe4[Fe(CN)6]3Fe_4[Fe(CN)_6]_3
B
K5Fe[Fe(CN)6]2K_5Fe[Fe(CN)_6]_2
C
HFe[Fe(CN)6]HFe[Fe(CN)_6]
D
KFe[Fe(CN)6]KFe[Fe(CN)_6]
127
[JEE Main 2021, 27 August Shift 1, Q55] 1 mol1\ mol of an octahedral metal complex with formula MCl3⋅2LMCl_3\cdot2L on reaction with excess of AgNO3AgNO_3 gives 1 mol1\ mol of AgClAgCl. The denticity of the ligand L is _______ . (Integer answer)
Not attempted
Your answer: —
Correct answer: 2
128
[JEE Main 2021, 27 August Shift 1, Q44] The nature of oxides V2O3V_2O_3 and CrOCrO is indexed as 'X' and 'Y' type respectively. The correct set of X and Y is :
Not attempted
A
X = basic, Y = amphoteric
B
X = amphoteric, Y = basic
C
X = acidic, Y = acidic
D
X = basic, Y = basic
129
[JEE Main 2021, 27 August Shift 1, Q57] The number of ff electrons in the ground state electronic configuration of NpNp (Z=93Z=93) is _______ . (Nearest integer)
Not attempted
Your answer: —
Correct answer: 4
130
[JEE Main 2021, 27 August Shift 1, Q36] Which refining process is generally used in the purification of low melting metals ?
Not attempted
A
Chromatographic method
B
Liquation
C
Electrolysis
D
Zone refining
131
[JEE Main 2021, 27 August Shift 1, Q50] Tyndall effect is more effectively shown by :
Not attempted
A
true solution
B
lyophilic colloid
C
lyophobic colloid
D
suspension
132
[JEE Main 2021, 27 August Shift 1, Q52] The reaction that occurs in a breath analyser, a device used to determine the alcohol level in a person's blood stream is 2K2Cr2O7+8H2SO4+3C2H6O→2Cr2(SO4)3+3C2H4O2+2K2SO4+11H2O2K_2Cr_2O_7+8H_2SO_4+3C_2H_6O\rightarrow2Cr_2(SO_4)_3+3C_2H_4O_2+2K_2SO_4+11H_2O If the rate of appearance of Cr2(SO4)3Cr_2(SO_4)_3 is 2.67 mol min−12.67\ mol\ min^{-1} at a particular time, the rate of disappearance of C2H6OC_2H_6O at the same time is _______ mol min−1mol\ min^{-1}. (Nearest integer)
Not attempted
Your answer: —
Correct answer: 4
133
[JEE Main 2021, 27 August Shift 1, Q54] 1 kg1\ kg of 0.750.75 molal aqueous solution of sucrose can be cooled up to −4∘C-4^\circ C before freezing. The amount of ice (in g) that will be separated out is _______ . (Nearest integer) [Given : Kf(H2O)=1.86 K kg mol−1K_f(H_2O)=1.86\ K\ kg\ mol^{-1}]
Not attempted
Your answer: —
Correct answer: 518
134
[JEE Main 2021, 27 August Shift 1, Q37] Match items of List-I with those of List-II : List-I (Property)List-II (Example)(a) Diamagnetism(i) MnO(b) Ferrimagnetism(ii) O2(c) Paramagnetism(iii) NaCl(d) Antiferromagnetism(iv) Fe3O4\displaystyle\begin{array}{|l|l|} \hline \textbf{List-I (Property)} & \textbf{List-II (Example)} \\ \hline \text{(a) Diamagnetism} & \text{(i) } MnO \\ \hline \text{(b) Ferrimagnetism} & \text{(ii) } O_2 \\ \hline \text{(c) Paramagnetism} & \text{(iii) } NaCl \\ \hline \text{(d) Antiferromagnetism} & \text{(iv) } Fe_3O_4 \\ \hline \end{array} Choose the most appropriate answer from the options given below :
Not attempted
A
(a)-(ii), (b)-(i), (c)-(iii), (d)-(iv)
B
(a)-(i), (b)-(iii), (c)-(iv), (d)-(ii)
C
(a)-(iii), (b)-(iv), (c)-(ii), (d)-(i)
D
(a)-(iv), (b)-(ii), (c)-(i), (d)-(iii)
135
[JEE Main 2021, 27 August Shift 1, Q42] The gas 'A' is having very low reactivity reaches to stratosphere. It is non-toxic and non-flammable but dissociated by UV-radiations in stratosphere. The intermediates formed initially from the gas 'A' are :
Not attempted
A
ClO∙+∙CF2ClClO^{\bullet}+{}^{\bullet}CF_2Cl
B
ClO∙+∙CH3ClO^{\bullet}+{}^{\bullet}CH_3
C
∙CH3+∙CF2Cl{}^{\bullet}CH_3+{}^{\bullet}CF_2Cl
D
Cl∙+∙CF2ClCl^{\bullet}+{}^{\bullet}CF_2Cl
136
[JEE Main 2021, 27 August Shift 1, Q31] In the following sequence of reactions, the final product D is : CH3−C≡C−H+NaNH2→ACH_3-C\equiv C-H+NaNH_2\rightarrow A A→the bromo alcohol shown in the figureB→H2/Pd−CC→CrO3DA\xrightarrow{\text{the bromo alcohol shown in the figure}}B\xrightarrow{H_2/Pd-C}C\xrightarrow{CrO_3}D
Not attempted
A
CH3−CH2−CH2−CH2−CH2−CHOCH_3-CH_2-CH_2-CH_2-CH_2-CHO
B
CH3−CH=CH−CH2−CH2−CH2−COOHCH_3-CH=CH-CH_2-CH_2-CH_2-COOH
C
CH3−CH=CH−CH(OH)−CH2−CH2−CH3CH_3-CH=CH-CH(OH)-CH_2-CH_2-CH_3
D
CH3−CH2−CH2−CH2−CH2−CO−CH3CH_3-CH_2-CH_2-CH_2-CH_2-CO-CH_3
137
[JEE Main 2021, 27 August Shift 1, Q51] In Carius method for estimation of halogens, 0.2 g0.2\ g of an organic compound gave 0.188 g0.188\ g of AgBrAgBr. The percentage of bromine in the compound is _______ . (Nearest integer) [Atomic mass : Ag=108Ag=108, Br=80Br=80]
Not attempted
Your answer: —
Correct answer: 40
138
[JEE Main 2021, 27 August Shift 1, Q56] The number of moles of CuOCuO, that will be utilized in Dumas method for estimation of nitrogen in a sample of 57.5 g57.5\ g of N,N-dimethylaminopentane is _______ ×10−2\times10^{-2}. (Nearest integer)
Not attempted
Your answer: —
Correct answer: 1125
139
[JEE Main 2021, 27 August Shift 1, Q34] In which one of the following molecules strongest back donation of an electron pair from halide to boron is expected?
Not attempted
A
BCl3BCl_3
B
BF3BF_3
C
BBr3BBr_3
D
BI3BI_3
140
[JEE Main 2021, 27 August Shift 1, Q49] In polythionic acid, H2SxO6H_2S_xO_6 (x=3x=3 to 55) the oxidation state(s) of sulphur is/are :
Not attempted
A
+5+5 only
B
+6+6 only
C
+3+3 and +5+5 only
D
00 and +5+5 only
141
[JEE Main 2021, 27 August Shift 1, Q43] The number of water molecules in gypsum, dead burnt plaster and plaster of paris, respectively, are :
Not attempted
A
2, 0 and 1
B
0.5, 0 and 2
C
5, 0 and 0.5
D
2, 0 and 0.5
142
[JEE Main 2021, 27 August Shift 1, Q35] Deuterium resembles hydrogen in properties but :
Not attempted
A
reacts slower than hydrogen
B
reacts vigorously than hydrogen
C
reacts just as hydrogen
D
emits β+\beta^+ particles
143
[JEE Main 2021, 27 August Shift 1, Q60] When 10 mL10\ mL of an aqueous solution of KMnO4KMnO_4 was titrated in acidic medium, equal volume of 0.1 M0.1\ M of an aqueous solution of ferrous sulphate was required for complete discharge of colour. The strength of KMnO4KMnO_4 in grams per litre is _______ ×10−2\times10^{-2}. (Nearest integer) [Atomic mass : K=39K=39, Mn=55Mn=55, O=16O=16]
Not attempted
Your answer: —
Correct answer: 316
144
[JEE Main 2021, 27 August Shift 1, Q59] The number of moles of NH3NH_3, that must be added to 2 L2\ L of 0.80 M0.80\ M AgNO3AgNO_3 in order to reduce the concentration of Ag+Ag^+ ions to 5.0×10−8 M5.0\times10^{-8}\ M (KformationK_{formation} for [Ag(NH3)2]+=1.0×108[Ag(NH_3)_2]^+=1.0\times10^8) is _______ . (Nearest integer) [Assume no volume change on adding NH3NH_3]
Not attempted
Your answer: —
Correct answer: 4
145
[JEE Main 2021, 27 August Shift 1, Q58] 200 mL200\ mL of 0.2 M0.2\ M HClHCl is mixed with 300 mL300\ mL of 0.1 M0.1\ M NaOHNaOH. The molar heat of neutralization of this reaction is −57.1 kJ-57.1\ kJ. The increase in temperature in ∘C^\circ C of the system on mixing is x×10−2x\times10^{-2}. The value of xx is _______ . (Nearest integer) [Given : Specific heat of water =4.18 J g−1K−1=4.18\ J\ g^{-1}K^{-1}, Density of water =1.00 g cm−3=1.00\ g\ cm^{-3}] (Assume no volume change on mixing)
Not attempted
Your answer: —
Correct answer: 82
146
[JEE Main 2021, 27 August Shift 1, Q48] The unit of the van der Waals gas equation parameter 'a' in (P+an2V2)(V−nb)=nRT\left(P+\dfrac{an^2}{V^2}\right)(V-nb)=nRT is :
Not attempted
A
kg m s−2kg\ m\ s^{-2}
B
dm3 mol−1dm^3\ mol^{-1}
C
kg m s−1kg\ m\ s^{-1}
D
atm dm6 mol−2atm\ dm^6\ mol^{-2}
147
[JEE Main 2021, 27 August Shift 1, Q33] Match List-I with List-II : List-I (Species)List-II (Number of lone pairs of electrons on the central atom)(a) XeF2(i) 0(b) XeO2F2(ii) 1(c) XeO3F2(iii) 2(d) XeF4(iv) 3\displaystyle\begin{array}{|l|l|} \hline \textbf{List-I (Species)} & \textbf{List-II (Number of lone pairs of electrons on the central atom)} \\ \hline \text{(a) } XeF_2 & \text{(i) } 0 \\ \hline \text{(b) } XeO_2F_2 & \text{(ii) } 1 \\ \hline \text{(c) } XeO_3F_2 & \text{(iii) } 2 \\ \hline \text{(d) } XeF_4 & \text{(iv) } 3 \\ \hline \end{array} Choose the most appropriate answer from the options given below :
Not attempted
A
(a)-(iv), (b)-(i), (c)-(ii), (d)-(iii)
B
(a)-(iii), (b)-(iv), (c)-(ii), (d)-(i)
C
(a)-(iii), (b)-(ii), (c)-(iv), (d)-(i)
D
(a)-(iv), (b)-(ii), (c)-(i), (d)-(iii)
148
[JEE Main 2021, 27 August Shift 1, Q53] The kinetic energy of an electron in the second Bohr orbit of a hydrogen atom is equal to h2x m a02\dfrac{h^2}{x\,m\,a_0^2}. The value of 10x10x is _______ . (a0a_0 is radius of Bohr's orbit) (Nearest integer) [Given : π=3.14\pi=3.14]
Not attempted
Your answer: —
Correct answer: 3155
149
[JEE Main 2021, 26 August Shift 2, Q45] Chlordiazepoxide has the structure shown in the figure. The class of drug to which chlordiazepoxide with above structure belongs is :
Not attempted
Chlordiazepoxide Chlordiazepoxide
A
Antacid
B
Analgesic
C
Tranquilizer
D
Antibiotic
150
[JEE Main 2021, 26 August Shift 2, Q36] Given below are two statements : one is labelled as Assertion (A)\textbf{(A)} and other is labelled as Reason (R)\textbf{(R)}. Assertion (A)\textbf{(A)} : Sucrose is a disaccharide and a non-reducing sugar. Reason (R)\textbf{(R)} : Sucrose involves glycosidic linkage between C1C_1 of β\beta-glucose and C2C_2 of α\alpha-fructose. Choose the most appropriate answer from the options given below :
Not attempted
A
Both (A)\textbf{(A)} and (R)\textbf{(R)} are true but (R)\textbf{(R)} is not the true explanation of (A)\textbf{(A)}
B
(A)\textbf{(A)} is false but (R)\textbf{(R)} is true
C
(A)\textbf{(A)} is true but (R)\textbf{(R)} is false
D
Both (A)\textbf{(A)} and (R)\textbf{(R)} are true and (R)\textbf{(R)} is the true explanation of (A)\textbf{(A)}
151
[JEE Main 2021, 26 August Shift 2, Q39] The major product in the above reaction is :
Not attempted
(CH3CO)2OP(Major product)
A
Both −CH2NH2-CH_2NH_2 and −CONH2-CONH_2 acetylated (two −NHCOCH3-NHCOCH_3 groups)
B
Only the amide −CONH2-CONH_2 acetylated; −CH2NH2-CH_2NH_2 left free
C
Ammonium acetate salt −CH2NH3+CH3COO−-CH_2NH_3^+CH_3COO^- with −CONHCOCH3-CONHCOCH_3
D
Only the aliphatic amine acetylated to −CH2NHCOCH3-CH_2NHCOCH_3; −CONH2-CONH_2 unchanged
152
[JEE Main 2021, 26 August Shift 2, Q37] Match List-I\textbf{List-I} with List-II\textbf{List-II} : List-I (Chemical Reaction)List-II (Reagent used)(a) CH3COOCH2CH3→CH3CH2OH(i) CH3MgBr/H3O+ (1 equivalent)(b) CH3COOCH3→CH3CHO(ii) H2SO4/H2O(c) CH3C≡N→CH3CHO(iii) DIBAL-H/H2O(d) CH3C≡N→CH3COCH3(iv) SnCl2,HCl/H2O\displaystyle\begin{array}{ll}\textbf{List-I (Chemical Reaction)} & \textbf{List-II (Reagent used)}\\ \text{(a) } CH_3COOCH_2CH_3 \rightarrow CH_3CH_2OH & \text{(i) } CH_3MgBr/H_3O^+ \text{ (1 equivalent)}\\ \text{(b) } CH_3COOCH_3 \rightarrow CH_3CHO & \text{(ii) } H_2SO_4/H_2O\\ \text{(c) } CH_3C\equiv N \rightarrow CH_3CHO & \text{(iii) } \text{DIBAL-H}/H_2O\\ \text{(d) } CH_3C\equiv N \rightarrow CH_3COCH_3 & \text{(iv) } SnCl_2, HCl/H_2O\end{array} Choose the most appropriate match :
Not attempted
A
a-ii, b-iv, c-iii, d-i
B
a-iv, b-ii, c-iii, d-i
C
a-ii, b-iii, c-iv, d-i
D
a-iii, b-ii, c-i, d-iv
153
[JEE Main 2021, 26 August Shift 2, Q49] Consider the given reaction. Identify X\textbf{X} and Y\textbf{Y} :
Not attempted
XHCN, H2O LiAlH4, H3O+"Y" (Major product)
A
XX = NaOHNaOH; YY = CH3CH2CH(CH3)CH(OH)NH2CH_3CH_2CH(CH_3)CH(OH)NH_2 (amino and hydroxyl on the same carbon)
B
XX = HNO3HNO_3; YY = CH3CH2CH(CH3)CH(OH)CH2NH2CH_3CH_2CH(CH_3)CH(OH)CH_2NH_2
C
XX = NaOHNaOH; YY = CH3CH2CH(CH3)CH(OH)CH2NH2CH_3CH_2CH(CH_3)CH(OH)CH_2NH_2
D
XX = HNO3HNO_3; YY = CH3CH2CH(CH3)CH(OH)NH2CH_3CH_2CH(CH_3)CH(OH)NH_2 (amino and hydroxyl on the same carbon)
154
[JEE Main 2021, 26 August Shift 2, Q31] Which one of the following phenols does not give colour when condensed with phthalic anhydride in presence of conc. H2SO4H_2SO_4 ?
Not attempted
A
Phenol
B
pp-Cresol (4-methylphenol)
C
Resorcinol (benzene-1,3-diol)
D
Catechol (benzene-1,2-diol)
155
[JEE Main 2021, 26 August Shift 2, Q40] Indicate the complex/complex ion which did not show any geometrical isomerism :
Not attempted
A
[CoCl2(en)2][CoCl_2(en)_2]
B
[Co(CN)5(NC)]3−[Co(CN)_5(NC)]^{3-}
C
[Co(NH3)3(NO2)3][Co(NH_3)_3(NO_2)_3]
D
[Co(NH3)4Cl2]+[Co(NH_3)_4Cl_2]^+
156
[JEE Main 2021, 26 August Shift 2, Q44] Arrange the following Cobalt complexes in the order of increasing Crystal Field Stabilization Energy (CFSE) value. Complexes : [CoF6]3−A\underset{A}{[CoF_6]^{3-}}, [Co(H2O)6]2+B\underset{B}{[Co(H_2O)_6]^{2+}}, [Co(NH3)6]3+C\underset{C}{[Co(NH_3)_6]^{3+}} and [Co(en)3]3+D\underset{D}{[Co(en)_3]^{3+}} Choose the correct option :
Not attempted
A
A<B<C<DA<B<C<D
B
B<A<C<DB<A<C<D
C
B<C<D<AB<C<D<A
D
C<D<B<AC<D<B<A
157
[JEE Main 2021, 26 August Shift 2, Q57] The overall stability constant of the complex ion [Cu(NH3)4]2+[Cu(NH_3)_4]^{2+} is 2.1×10132.1\times10^{13}. The overall dissociation constant is y×10−14y\times10^{-14}. Then yy is ____. (Nearest integer)
Not attempted
Your answer: —
Correct answer: 5
158
[JEE Main 2021, 26 August Shift 2, Q42] Given below are two statements : Statement I\textbf{Statement I} : Sphalerite is a sulphide ore of zinc and copper glance is a sulphide ore of copper. Statement II\textbf{Statement II} : It is possible to separate two sulphide ores by adjusting proportion of oil to water or by using 'depressants' in a froth flotation method. Choose the most appropriate answer from the options given below :
Not attempted
A
Statement I\textbf{Statement I} is true but Statement II\textbf{Statement II} is false
B
Both Statement I\textbf{Statement I} and Statement II\textbf{Statement II} are true
C
Statement I\textbf{Statement I} is false but Statement II\textbf{Statement II} is true
D
Both Statement I\textbf{Statement I} and Statement II\textbf{Statement II} are false
159
[JEE Main 2021, 26 August Shift 2, Q41] The sol given below with negatively charged colloidal particles is :
Not attempted
A
FeCl3FeCl_3 added to hot water
B
KIKI added to AgNO3AgNO_3 solution
C
AgNO3AgNO_3 added to KIKI solution
D
Al2O3⋅xH2OAl_2O_3\cdot xH_2O in water
160
[JEE Main 2021, 26 August Shift 2, Q59] The reaction rate for the reaction [PtCl4]2−+H2O⇌[Pt(H2O)Cl3]−+Cl−[PtCl_4]^{2-}+H_2O\rightleftharpoons[Pt(H_2O)Cl_3]^-+Cl^- was measured as a function of concentrations of different species. It was observed that −d[[PtCl4]2−]dt=4.8×10−5[[PtCl4]2−]−2.4×10−3[[Pt(H2O)Cl3]−][Cl−]\dfrac{-d[[PtCl_4]^{2-}]}{dt}=4.8\times10^{-5}[[PtCl_4]^{2-}]-2.4\times10^{-3}[[Pt(H_2O)Cl_3]^-][Cl^-] where square brackets are used to denote molar concentrations. The equilibrium constant Kc=K_c= ____. (Nearest integer)
Not attempted
Your answer: —
Correct answer: 0
161
[JEE Main 2021, 26 August Shift 2, Q55] For the galvanic cell, Zn(s)+Cu2+(0.02 M)→Zn2+(0.04 M)+Cu(s)Zn(s)+Cu^{2+}(0.02\ M)\rightarrow Zn^{2+}(0.04\ M)+Cu(s), Ecell=E_{cell}= ____ ×10−2\times10^{-2} V. (Nearest integer) [Use : ECu/Cu2+0=−0.34E^0_{Cu/Cu^{2+}}=-0.34 V, EZn/Zn2+0=+0.76E^0_{Zn/Zn^{2+}}=+0.76 V, 2.303RTF=0.059\dfrac{2.303RT}{F}=0.059 V]
Not attempted
Your answer: —
Correct answer: 109
162
[JEE Main 2021, 26 August Shift 2, Q58] 8383 g of ethylene glycol dissolved in 625625 g of water. The freezing point of the solution is ____ K. (Nearest integer) [Use : Molal Freezing point depression constant of water =1.86=1.86 K kg mol−1^{-1}] Freezing Point of water =273=273 K Atomic masses : C : 12.012.0, O : 16.016.0, H : 1.01.0 u]
Not attempted
Your answer: —
Correct answer: 269
163
[JEE Main 2021, 26 August Shift 2, Q32] Given below are two statements : one is labelled as Assertion (A)\textbf{(A)} and the other is labelled as Reason (R)\textbf{(R)}. Assertion (A)\textbf{(A)} : Photochemical smog causes cracking of rubber. Reason (R)\textbf{(R)} : Presence of ozone, nitric oxide, acrolein, formaldehyde and peroxyacetyl nitrate in photochemical smog makes it oxidizing. Choose the most appropriate answer from the options given below :
Not attempted
A
Both (A)\textbf{(A)} and (R)\textbf{(R)} are true but (R)\textbf{(R)} is not the true explanation of (A)\textbf{(A)}
B
(A)\textbf{(A)} is false but (R)\textbf{(R)} is true
C
(A)\textbf{(A)} is true but (R)\textbf{(R)} is false
D
Both (A)\textbf{(A)} and (R)\textbf{(R)} are true and (R)\textbf{(R)} is the true explanation of (A)\textbf{(A)}
164
[JEE Main 2021, 26 August Shift 2, Q50] Consider the given reaction, the product AA is :
Not attempted
Br2AlBr3(C2H5)2O"A"(Major product)
A
Bromine on the terminal carbon of the chain, C6H5CO(CH2)4BrC_6H_5CO(CH_2)_4Br
B
pp-Bromo derivative, pp-BrC6H4COC4H9BrC_6H_4COC_4H_9
C
mm-Bromo derivative, mm-BrC6H4COC4H9BrC_6H_4COC_4H_9
D
Bromine on carbon 4 of the chain, C6H5COCH2CH2CH(Br)CH3C_6H_5COCH_2CH_2CH(Br)CH_3
165
[JEE Main 2021, 26 August Shift 2, Q60] A chloro compound "A". (i) forms aldehydes on ozonolysis followed by the hydrolysis. (ii) when vaporized completely 1.531.53 g of A, gives 448448 mL of vapour at STP. The number of carbon atoms in a molecule of compound AA is ____.
Not attempted
Your answer: —
Correct answer: 3
166
[JEE Main 2021, 26 August Shift 2, Q47] Which one of the following compounds is not aromatic ?
Not attempted
A
Cycloheptatrienyl cation
B
Cyclopentadienyl anion
C
Cyclooctatetraene
D
Phenol
167
[JEE Main 2021, 26 August Shift 2, Q48] The number of stereoisomers possible for 1,21,2-dimethyl cyclopropane is :
Not attempted
A
One
B
Four
C
Two
D
Three
168
[JEE Main 2021, 26 August Shift 2, Q51] In the sulphur estimation, 0.4710.471 g of an organic compound gave 1.441.44 g of barium sulphate. The percentage of sulphur in the compound is ____ %. (Nearest integer) (Atomic Mass of Ba =137=137 u)
Not attempted
Your answer: —
Correct answer: 42
169
[JEE Main 2021, 26 August Shift 2, Q34] The number of non-ionisable hydrogen atoms present in the final product obtained from the hydrolysis of PCl5PCl_5 is :
Not attempted
A
00
B
22
C
11
D
33
170
[JEE Main 2021, 26 August Shift 2, Q46] Chalcogen group elements are :
Not attempted
A
Se, Tb and Pu
B
Se, Te and Po
C
S, Te and Pm
D
O, Ti and Po
171
[JEE Main 2021, 26 August Shift 2, Q38] Given below are two statements : one is labelled as Assertion (A)\textbf{(A)} and the other is labelled as Reason (R)\textbf{(R)}. Assertion (A)\textbf{(A)} : Barium carbonate is insoluble in water and is highly stable. Reason (R)\textbf{(R)} : The thermal stability of the carbonates increases with increasing cationic size. Choose the most appropriate answer from the options given below :
Not attempted
A
Both (A)\textbf{(A)} and (R)\textbf{(R)} are true and (R)\textbf{(R)} is the true explanation of (A)\textbf{(A)}
B
(A)\textbf{(A)} is true but (R)\textbf{(R)} is false
C
Both (A)\textbf{(A)} and (R)\textbf{(R)} are true but (R)\textbf{(R)} is not the true explanation of (A)\textbf{(A)}
D
(A)\textbf{(A)} is false but (R)\textbf{(R)} is true
172
[JEE Main 2021, 26 August Shift 2, Q43] Given below are two statements : one is labelled as Assertion (A)\textbf{(A)} and the other is labelled as Reason (R)\textbf{(R)}. Assertion (A)\textbf{(A)} : Heavy water is used for the study of reaction mechanism. Reason (R)\textbf{(R)} : The rate of reaction for the cleavage of O−HO-H bond is slower than that of O−DO-D bond. Choose the most appropriate answer from the options given below :
Not attempted
A
Both (A)\textbf{(A)} and (R)\textbf{(R)} are true but (R)\textbf{(R)} is not the true explanation of (A)\textbf{(A)}.
B
Both (A)\textbf{(A)} and (R)\textbf{(R)} are true and (R)\textbf{(R)} is the true explanation of (A)\textbf{(A)}.
C
(A)\textbf{(A)} is false but (R)\textbf{(R)} is true.
D
(A)\textbf{(A)} is true but (R)\textbf{(R)} is false.
173
[JEE Main 2021, 26 August Shift 2, Q52] The equilibrium constant KcK_c at 298298 K for the reaction A+B⇌C+DA+B\rightleftharpoons C+D is 100100. Starting with an equimolar solution with concentrations of AA, BB, CC and DD all equal to 11 M, the equilibrium concentration of DD is ____ ×10−2\times 10^{-2} M. (Nearest integer)
Not attempted
Your answer: —
Correct answer: 182
174
[JEE Main 2021, 26 August Shift 2, Q53] For water ΔvapH=41\Delta_{vap}H=41 kJ mol−1^{-1} at 373373 K and 11 bar pressure. Assuming that water vapour is an ideal gas that occupies a much larger volume than liquid water, the internal energy change during evaporation of water is ____ kJ mol−1^{-1}. [Use : R=8.3R=8.3 J mol−1^{-1} K−1^{-1}]
Not attempted
Your answer: —
Correct answer: 38
175
[JEE Main 2021, 26 August Shift 2, Q33] The interaction energy of London forces between two particles is proportional to rxr^x, where rr is the distance between the particles. The value of xx is :
Not attempted
A
33
B
−3-3
C
−6-6
D
66
176
[JEE Main 2021, 26 August Shift 2, Q35] The bond order and magnetic behaviour of O2−O_2^- ion are, respectively :
Not attempted
A
1.51.5 and paramagnetic
B
1.51.5 and diamagnetic
C
22 and diamagnetic
D
11 and paramagnetic
177
[JEE Main 2021, 26 August Shift 2, Q54] A metal surface is exposed to 500500 nm radiation. The threshold frequency of the metal for photoelectric current is 4.3×10144.3\times10^{14} Hz. The velocity of ejected electron is ____ ×105\times10^{5} m s−1^{-1}. (Nearest integer) [Use : h=6.63×10−34h=6.63\times10^{-34} Js, me=9.0×10−31m_e=9.0\times10^{-31} kg]
Not attempted
Your answer: —
Correct answer: 5
178
[JEE Main 2021, 26 August Shift 2, Q56] 100100 mL of Na3PO4Na_3PO_4 solution contains 3.453.45 g of sodium. The molarity of the solution is ____ ×10−2\times10^{-2} mol L−1^{-1}. (Nearest integer) [Atomic Masses - Na : 23.023.0 u, O : 16.016.0 u, P : 31.031.0 u]
Not attempted
Your answer: —
Correct answer: 50
179
[JEE Main 2021, 26 August Shift 1, Q37] The polymer formed on heating Novolac with formaldehyde is :
Not attempted
A
Bakelite
B
Polyester
C
Melamine
D
Nylon 6,6
180
[JEE Main 2021, 26 August Shift 1, Q35] The major product formed in the following reaction is : Tryptophan (indole-3-CH2CH_2-CH(NH2)CH(NH_2)-COOHCOOH) →SOCl2, CH3OH\xrightarrow{SOCl_2,\ CH_3OH} Major product
Not attempted
A
Methyl ester with hydrochloride salts at both the ring NN-HH and the amino group: indole-3-CH2CH(NH2⋅HCl)CO2CH3CH_2CH(NH_2\cdot HCl)CO_2CH_3 with N⋅HClN\cdot HCl on the indole nitrogen
B
5-Chloro-tryptophan methyl ester (a chlorine on the benzene ring of the indole, free NH2NH_2, CO2MeCO_2Me)
C
Tryptophan methyl ester hydrochloride: indole-3-CH2CH(NH2⋅HCl)CO2CH3CH_2CH(NH_2\cdot HCl)CO_2CH_3 (indole NN-HH unchanged)
D
Tryptophan acid chloride: indole-3-CH2CH(NH2)COClCH_2CH(NH_2)COCl
181
[JEE Main 2021, 26 August Shift 1, Q59] The total number of negative charge in the tetrapeptide, Gly-Glu-Asp-Tyr, at pH 12.512.5 will be _______. (Integer answer)
Not attempted
Your answer: —
Correct answer: 4
182
[JEE Main 2021, 26 August Shift 1, Q34] The major products formed in the following reaction sequence A and B are : C6H5COCH3 →Br2/KOH A+BC_6H_5COCH_3\ \xrightarrow{Br_2/KOH}\ A+B
Not attempted
A
A=C6H5COOKA=C_6H_5COOK, B=CHBr3B=CHBr_3
B
A=A= 3-bromophenacyl bromide (3-Br-C6H4COCH2Br3\text{-}Br\text{-}C_6H_4COCH_2Br), B=B= 3-bromo-ω\omega-hydroxyacetophenone (3-Br-C6H4COCH2OH3\text{-}Br\text{-}C_6H_4COCH_2OH)
C
A=C6H5COCBr3A=C_6H_5COCBr_3, B=C6H5CHOB=C_6H_5CHO
D
A=A= 3,5-dibromoacetophenone, B=B= 3,5-dihydroxyacetophenone
183
[JEE Main 2021, 26 August Shift 1, Q39] The correct options for the products A and B of the following reactions are : A← Br2 (excess), H2O  C6H5OH → Br2, CS2, <5∘C  BA\xleftarrow{\ Br_2\ (excess),\ H_2O\ }\ C_6H_5OH\ \xrightarrow{\ Br_2,\ CS_2,\ <5^\circ C\ }\ B
Not attempted
A
A=A= 2,4,6-tribromophenol, B=B= 2,4,6-tribromophenol
B
A=A= 2,4,6-tribromophenol, B=B= 4-bromophenol
C
A=A= 2,4,6-tribromophenol, B=B= 2-bromophenol
D
A=A= 4-bromophenol, B=B= 4-bromophenol
184
[JEE Main 2021, 26 August Shift 1, Q42] Among the following compounds I-IV, which one forms a yellow precipitate on reacting sequentially with (i) NaOH (ii) dil. HNO3HNO_3 (iii) AgNO3AgNO_3 ? I : 4-chlorotoluene, II : 3-chlorotoluene, III : 2-bromotoluene, IV : 1-chloro-2-(iodomethyl)benzene (o-chlorobenzyl iodide).
Not attempted
ClH3CIClCH3IIBrCH3IIIClCH2IIV
A
II
B
IV
C
I
D
III
185
[JEE Main 2021, 26 August Shift 1, Q31] Which one of the following complexes is violet in colour?
Not attempted
A
[Fe(CN)6]4−[Fe(CN)_6]^{4-}
B
[Fe(SCN)6]4−[Fe(SCN)_6]^{4-}
C
Fe4[Fe(CN)6]3⋅H2OFe_4[Fe(CN)_6]_3\cdot H_2O
D
[Fe(CN)5NOS]4−[Fe(CN)_5NOS]^{4-}
186
[JEE Main 2021, 26 August Shift 1, Q33] Which one of the following when dissolved in water gives coloured solution in nitrogen atmosphere?
Not attempted
A
CuCl2CuCl_2
B
AgClAgCl
C
ZnCl2ZnCl_2
D
Cu2Cl2Cu_2Cl_2
187
[JEE Main 2021, 26 August Shift 1, Q55] The number of 4f4f electrons in the ground state electronic configuration of Gd2+Gd^{2+} is _______. [Atomic number of Gd =64=64]
Not attempted
Your answer: —
Correct answer: 7
188
[JEE Main 2021, 26 August Shift 1, Q44] Given below are two statements. Statement I\textbf{Statement I} : The choice of reducing agents for metals extraction can be made by using Ellingham diagram, a plot of ΔG\Delta G vs temperature. Statement II\textbf{Statement II} : The value of ΔS\Delta S increases from left to right in Ellingham diagram. In the light of the above statements, choose the most appropriate answer from the options given below :
Not attempted
A
Both Statement I and Statement II are true.
B
Statement I is false but Statement II is true.
C
Both Statement I and Statement II are false.
D
Statement I is true but Statement II is false.
189
[JEE Main 2021, 26 August Shift 1, Q32] Which one of the following is correct for the adsorption of a gas at a given temperature on a solid surface?
Not attempted
A
ΔH>0, ΔS>0\Delta H>0,\ \Delta S>0
B
ΔH>0, ΔS<0\Delta H>0,\ \Delta S<0
C
ΔH<0, ΔS<0\Delta H<0,\ \Delta S<0
D
ΔH<0, ΔS>0\Delta H<0,\ \Delta S>0
190
[JEE Main 2021, 26 August Shift 1, Q57] The following data was obtained for chemical reaction given below at 975975 K. 2NO(g)+2H2(g)→N2(g)+2H2O(g)2NO(g)+2H_2(g)\to N_2(g)+2H_2O(g) [NO] (mol L−1)[H2] (mol L−1)Rate (mol L−1s−1)(A)8×10−58×10−57×10−9(B)24×10−58×10−52.1×10−8(C)24×10−532×10−58.4×10−8\displaystyle\begin{array}{|c|c|c|c|} \hline & [NO]\ (mol\ L^{-1}) & [H_2]\ (mol\ L^{-1}) & \text{Rate}\ (mol\ L^{-1}s^{-1}) \\ \hline \text{(A)} & 8\times10^{-5} & 8\times10^{-5} & 7\times10^{-9} \\ \hline \text{(B)} & 24\times10^{-5} & 8\times10^{-5} & 2.1\times10^{-8} \\ \hline \text{(C)} & 24\times10^{-5} & 32\times10^{-5} & 8.4\times10^{-8} \\ \hline \end{array} The order of the reaction with respect to NONO is _______. [Integer answer]
Not attempted
Your answer: —
Correct answer: 1
191
[JEE Main 2021, 26 August Shift 1, Q38] Given below are two statements : Statement I\textbf{Statement I} : The limiting molar conductivity of KCl (strong electrolyte) is higher compared to that of CH3COOHCH_3COOH (weak electrolyte). Statement II\textbf{Statement II} : Molar conductivity decreases with decrease in concentration of electrolyte. In the light of the above statements, choose the most appropriate answer from the options given below :
Not attempted
A
Statement I is true but Statement II is false.
B
Statement I is false but Statement II is true.
C
Both Statement I and Statement II are true.
D
Both Statement I and Statement II are false.
192
[JEE Main 2021, 26 August Shift 1, Q52] These are physical properties of an element. (A) Sublimation enthalpy (B) Ionisation enthalpy (C) Hydration enthalpy (D) Electron gain enthalpy The total number of above properties that affect the reduction potential is _______. (Integer answer)
Not attempted
Your answer: —
Correct answer: 3
193
[JEE Main 2021, 26 August Shift 1, Q53] Of the following four aqueous solutions, total number of those solutions whose freezing point is lower than that of 0.10 M C2H5OH0.10\ M\ C_2H_5OH is _______. (Integer answer) (i) 0.10 M Ba3(PO4)20.10\ M\ Ba_3(PO_4)_2 (ii) 0.10 M Na2SO40.10\ M\ Na_2SO_4 (iii) 0.10 M KCl0.10\ M\ KCl (iv) 0.10 M Li3PO40.10\ M\ Li_3PO_4
Not attempted
Your answer: —
Correct answer: 4
194
[JEE Main 2021, 26 August Shift 1, Q60] An aqueous KCl solution of density 1.201.20 g mL−1^{-1} has a molality of 3.303.30 mol kg−1^{-1}. The molarity of the solution in mol L−1^{-1} is _______. (Nearest integer) [Molar mass of KCl =74.5=74.5]
Not attempted
Your answer: —
Correct answer: 3
195
[JEE Main 2021, 26 August Shift 1, Q48] Given below are two statements. Statement I\textbf{Statement I} : Frenkel defects are vacancy as well as interstitial defects. Statement II\textbf{Statement II} : Frenkel defect leads to colour in ionic solids due to presence of F-centres. Choose the most appropriate answer for the statements from the options given below :
Not attempted
A
Statement I is false but Statement II is true.
B
Both Statement I and Statement II are true.
C
Statement I is true but Statement II is false.
D
Both Statement I and Statement II are false.
196
[JEE Main 2021, 26 August Shift 1, Q40] The conversion of hydroxyapatite occurs due to presence of F−F^- ions in water. The correct formula of hydroxyapatite is :
Not attempted
A
[3Ca3(PO4)2⋅Ca(OH)2][3Ca_3(PO_4)_2\cdot Ca(OH)_2]
B
[3Ca(OH)2⋅CaF2][3Ca(OH)_2\cdot CaF_2]
C
[Ca3(PO4)2⋅CaF2][Ca_3(PO_4)_2\cdot CaF_2]
D
[3Ca3(PO4)2⋅CaF2][3Ca_3(PO_4)_2\cdot CaF_2]
197
[JEE Main 2021, 26 August Shift 1, Q36] The major product formed in the following reaction is : CH2=C(CH3)−CH=CH2CH_2=C(CH_3)-CH=CH_2 (isoprene, in excess) →HBr\xrightarrow{HBr} Major product
Not attempted
A
(CH3)2C=CH−CH2Br(CH_3)_2C=CH-CH_2Br (1-bromo-3-methylbut-2-ene)
B
(CH3)2C(Br)−CH(Br)−CH3(CH_3)_2C(Br)-CH(Br)-CH_3 (2,3-dibromo-2-methylbutane)
C
(CH3)2C(Br)−CH=CH2(CH_3)_2C(Br)-CH=CH_2 (3-bromo-3-methylbut-1-ene)
D
BrCH2−CH(CH3)−CH2−CH2BrBrCH_2-CH(CH_3)-CH_2-CH_2Br (1,4-dibromo-2-methylbutane)
198
[JEE Main 2021, 26 August Shift 1, Q47] The correct sequential addition of reagents in the preparation of 3-nitrobenzoic acid from benzene is :
Not attempted
A
Br2/AlBr3Br_2/AlBr_3, HNO3/H2SO4HNO_3/H_2SO_4, MgMg/ether, CO2CO_2, H3O+H_3O^+
B
Br2/AlBr3Br_2/AlBr_3, NaCNNaCN, H3O+H_3O^+, HNO3/H2SO4HNO_3/H_2SO_4
C
Br2/AlBr3Br_2/AlBr_3, HNO3/H2SO4HNO_3/H_2SO_4, NaCNNaCN, H3O+H_3O^+
D
HNO3/H2SO4HNO_3/H_2SO_4, Br2/AlBr3Br_2/AlBr_3, MgMg/ether, CO2CO_2, H3O+H_3O^+
199
[JEE Main 2021, 26 August Shift 1, Q50] Excess of isobutane on reaction with Br2Br_2 in presence of light at 125∘C125^\circ C gives which one of the following, as the major product?
Not attempted
A
CH3−CBr(CH3)−CH2BrCH_3-CBr(CH_3)-CH_2Br
B
CH3−CH(CH2Br)−CH2BrCH_3-CH(CH_2Br)-CH_2Br
C
CH3−CH(CH3)−CH2BrCH_3-CH(CH_3)-CH_2Br
D
(CH3)3C−Br(CH_3)_3C-Br
200
[JEE Main 2021, 26 August Shift 1, Q49] The incorrect statement is :
Not attempted
A
Cl2Cl_2 is more reactive than ClFClF.
B
F2F_2 is more reactive than ClFClF.
C
On hydrolysis ClFClF forms HOClHOCl and HFHF.
D
F2F_2 is a stronger oxidizing agent than Cl2Cl_2 in aqueous solution.
201
[JEE Main 2021, 26 August Shift 1, Q56] The ratio of number of water molecules in Mohr's salt and potash alum is _______ ×10−1\times10^{-1}.
Not attempted
Your answer: —
Correct answer: 5
202
[JEE Main 2021, 26 August Shift 1, Q45] What are the products formed in sequence when excess of CO2CO_2 is passed in slaked lime?
Not attempted
A
Ca(HCO3)2, CaCO3Ca(HCO_3)_2,\ CaCO_3
B
CaCO3, Ca(HCO3)2CaCO_3,\ Ca(HCO_3)_2
C
CaO, Ca(HCO3)2CaO,\ Ca(HCO_3)_2
D
CaO, CaCO3CaO,\ CaCO_3
203
[JEE Main 2021, 26 August Shift 1, Q43] Which one of the following methods is most suitable for preparing deionized water?
Not attempted
A
Synthetic resin method
B
Clark's method
C
Calgon's method
D
Permutit method
204
[JEE Main 2021, 26 August Shift 1, Q41] Given below are two statements. Statement I\textbf{Statement I} : In the titration between strong acid and weak base methyl orange is suitable as an indicator. Statement II\textbf{Statement II} : For titration of acetic acid with NaOH phenolphthalein is not a suitable indicator. In the light of the above statements, choose the most appropriate answer from the options given below.
Not attempted
A
Statement I is false but Statement II is true.
B
Statement I is true but Statement II is false.
C
Both Statement I and Statement II are true.
D
Both Statement I and Statement II are false.
205
[JEE Main 2021, 26 August Shift 1, Q54] The OH−OH^- concentration in a mixture of 5.05.0 mL of 0.0504 M NH4Cl0.0504\ M\ NH_4Cl and 22 mL of 0.0210 M NH30.0210\ M\ NH_3 solution is x×10−6 Mx\times10^{-6}\ M. The value of xx is _______. (Nearest integer) [Given Kw=1×10−14K_w=1\times10^{-14} and Kb=1.8×10−5K_b=1.8\times10^{-5}]
Not attempted
Your answer: —
Correct answer: 3
206
[JEE Main 2021, 26 August Shift 1, Q51] AB3AB_3 is an interhalogen T-shaped molecule. The number of lone pairs of electrons on A is _______. (Integer answer)
Not attempted
Your answer: —
Correct answer: 2
207
[JEE Main 2021, 26 August Shift 1, Q58] The Born-Haber cycle for KCl is evaluated with the following data : ΔfH⊖\Delta_fH^\ominus for KCl=−436.7KCl=-436.7 kJ mol−1^{-1}; ΔsubH⊖\Delta_{sub}H^\ominus for K=89.2K=89.2 kJ mol−1^{-1}; ΔionizationH⊖\Delta_{ionization}H^\ominus for K=419.0K=419.0 kJ mol−1^{-1}; Δelectron gainH⊖\Delta_{electron\ gain}H^\ominus for Cl(g)=−348.6Cl(g)=-348.6 kJ mol−1^{-1}; ΔbondH⊖\Delta_{bond}H^\ominus for Cl2=243.0Cl_2=243.0 kJ mol−1^{-1}. The magnitude of lattice enthalpy of KCl in kJ mol−1^{-1} is _______. (Nearest integer)
Not attempted
Your answer: —
Correct answer: 718
208
[JEE Main 2021, 26 August Shift 1, Q46] Given below are two statements. Statement I\textbf{Statement I} : According to Bohr's model of an atom, qualitatively the magnitude of velocity of electron increases with decrease in positive charges on the nucleus as there is no strong hold on the electron by the nucleus. Statement II\textbf{Statement II} : According to Bohr's model of an atom, qualitatively the magnitude of velocity of electron increases with decrease in principal quantum number. In the light of the above statements, choose the most appropriate answer from the options given below :
Not attempted
A
Both Statement I and Statement II are false.
B
Both Statement I and Statement II are true.
C
Statement I is false but Statement II is true.
D
Statement I is true but Statement II is false.
209
[JEE Main 2021, 27 July Shift 2, Q40] Given below are two statements: Statement I\textbf{Statement I}: Penicillin is a bacteriostatic type antibiotic. Statement II\textbf{Statement II}: The general structure of penicillin is as shown in the figure (a β\beta-lactam ring fused to a thiazolidine ring carrying two methyl groups and a carboxyl group, with an acylamino side chain R−CO−NH−\mathrm{R-CO-NH-}). Choose the correct option:
Not attempted
NSOCH3CH3COOHHNHOR
A
Both Statement I and Statement II are true
B
Statement I is correct but Statement II is false
C
Statement I is incorrect but Statement II is true
D
Both Statement I and Statement II are false
210
[JEE Main 2021, 27 July Shift 2, Q34] Compound A gives D-Galactose and D-Glucose on hydrolysis. The compound A is:
Not attempted
A
Amylose
B
Sucrose
C
Maltose
D
Lactose
211
[JEE Main 2021, 27 July Shift 2, Q36] What is A in the following reaction (see figure)? Benzyl bromide is treated with potassium phthalimide (step i) and then with O−H/H2O\mathrm{\overset{-}{O}H/H_2O} (step ii).
Not attempted
CH2BrOONK(i)(ii) OH/ H2OA(Major Product)
A
Structure (A)\text{Structure (A)}
CH2NH2
B
Structure (B)\text{Structure (B)}
ONH
C
Structure (C)\text{Structure (C)}
OONH
D
Structure (D)\text{Structure (D)}
CH2OH
212
[JEE Main 2021, 27 July Shift 2, Q38] The correct sequence of reagents for the following transformation (nitrobenzene to 3-chlorophenol, see figure) is:
Not attempted
NO2OHCl
A
(i) Cl2,FeCl3\mathrm{Cl_2,FeCl_3}; (ii) NaNO2,HCl,0∘C\mathrm{NaNO_2,HCl,0^\circ C}; (iii) Fe,HCl\mathrm{Fe,HCl}; (iv) H2O/H+\mathrm{H_2O/H^+}
B
(i) Cl2,FeCl3\mathrm{Cl_2,FeCl_3}; (ii) Fe,HCl\mathrm{Fe,HCl}; (iii) NaNO2,HCl,0∘C\mathrm{NaNO_2,HCl,0^\circ C}; (iv) H2O/H+\mathrm{H_2O/H^+}
C
(i) Fe,HCl\mathrm{Fe,HCl}; (ii) Cl2,HCl\mathrm{Cl_2,HCl}; (iii) NaNO2,HCl,0∘C\mathrm{NaNO_2,HCl,0^\circ C}; (iv) H2O/H+\mathrm{H_2O/H^+}
D
(i) Fe,HCl\mathrm{Fe,HCl}; (ii) NaNO2,HCl,0∘C\mathrm{NaNO_2,HCl,0^\circ C}; (iii) H2O/H+\mathrm{H_2O/H^+}; (iv) Cl2,FeCl3\mathrm{Cl_2,FeCl_3}
213
[JEE Main 2021, 27 July Shift 2, Q39] R−CN→(ii) H2O(i) DIBAL-HR−Y\mathrm{R-CN}\xrightarrow[\text{(ii) }\mathrm{H_2O}]{\text{(i) DIBAL-H}}\mathrm{R-Y} Consider the above reaction and identify Y.
Not attempted
A
−COOH\mathrm{-COOH}
B
−CH2NH2\mathrm{-CH_2NH_2}
C
−CHO\mathrm{-CHO}
D
−CONH3\mathrm{-CONH_3}
214
[JEE Main 2021, 27 July Shift 2, Q43] Consider the reaction of methyl 2-(1-hydroxyethyl)acrylate with conc. HBr (see figure). The major product P formed is:
Not attempted
H3COHOOCH3Conc. HBr"P"(Major Product)
A
Structure (A)\text{Structure (A)}
H3COBrOOCH3
B
Structure (B)\text{Structure (B)}
H3CBrOOCH3
C
Structure (C)\text{Structure (C)}
H3CBrOBr
D
Structure (D)\text{Structure (D)}
BrH3COOCH3
215
[JEE Main 2021, 27 July Shift 2, Q49] In the reaction shown in the figure, 1-phenylpropan-1-ol is heated with conc. H2SO4\mathrm{H_2SO_4} to give A (trans-1-phenylprop-1-ene) and B (cis-1-phenylprop-1-ene). Consider the above reaction, and choose the correct statement:
Not attempted
OHConc. H2SO4ΔA+B
A
Both compounds A and B are formed equally
B
The reaction is not possible in acidic medium
C
Compound A will be the major product
D
Compound B will be the major product
216
[JEE Main 2021, 27 July Shift 2, Q46] Given below are two statements: Statement I\textbf{Statement I}: [Mn(CN)6]3−\left[\mathrm{Mn(CN)_6}\right]^{3-}, [Fe(CN)6]3−\left[\mathrm{Fe(CN)_6}\right]^{3-} and [Co(C2O4)3]3−\left[\mathrm{Co(C_2O_4)_3}\right]^{3-} are d2sp3d^2sp^3 hybridised. Statement II\textbf{Statement II}: [MnCl6]3−\left[\mathrm{MnCl_6}\right]^{3-} and [FeF6]3−\left[\mathrm{FeF_6}\right]^{3-} are paramagnetic and have 4 and 5 unpaired electrons, respectively. In the light of the above statements, choose the correct answer from the options given below:
Not attempted
A
Statement I is correct but Statement II is false
B
Both Statement I and Statement II are false
C
Statement I is incorrect but Statement II is true
D
Both Statement I and Statement II are true
217
[JEE Main 2021, 27 July Shift 2, Q58] 3 moles of the metal complex with formula Co(en)2Cl3\mathrm{Co(en)_2Cl_3} gives 3 moles of silver chloride on treatment with excess of silver nitrate. The secondary valency of Co in the complex is __________. (Round off to the Nearest Integer)
Not attempted
Your answer: —
Correct answer: 6
218
[JEE Main 2021, 27 July Shift 2, Q42] The addition of silica during the extraction of copper from its sulphide ore:
Not attempted
A
reduces copper sulphide into metallic copper
B
reduces the melting point of the reaction mixture
C
converts copper sulphide into copper silicate
D
converts iron oxide into iron silicate
219
[JEE Main 2021, 27 July Shift 2, Q33] Given below are two statements: one is labelled as Assertion A and the other is labelled as Reason R. Assertion A\textbf{Assertion A}: SO2(g)\mathrm{SO_2(g)} is adsorbed to a larger extent than H2(g)\mathrm{H_2(g)} on activated charcoal. Reason R\textbf{Reason R}: SO2(g)\mathrm{SO_2(g)} has a higher critical temperature than H2(g)\mathrm{H_2(g)}. In the light of the above statements, choose the most appropriate answer from the options given below.
Not attempted
A
Both A and R are correct but R is not the correct explanation of A.
B
A is not correct but R is correct.
C
A is correct but R is not correct.
D
Both A and R are correct and R is the correct explanation of A.
220
[JEE Main 2021, 27 July Shift 2, Q52] For the first order reaction A→2B\mathrm{A\rightarrow 2B}, 1 mole of reactant A gives 0.2 moles of B after 100 minutes. The half life of the reaction is __________ min. (Round off to the Nearest Integer) [Use: ln⁡2=0.69\ln2=0.69, ln⁡10=2.3\ln10=2.3. Properties of logarithms: ln⁡xy=yln⁡x\ln x^y=y\ln x; ln⁡xy=ln⁡x−ln⁡y\ln\dfrac{x}{y}=\ln x-\ln y]
Not attempted
Your answer: —
Correct answer: 655
221
[JEE Main 2021, 27 July Shift 2, Q55] For the cell Cu(s) ∣ Cu2+(aq)(0.1 M) ∣∣ Ag+(aq)(0.01 M) ∣ Ag(s)\mathrm{Cu(s)\,|\,Cu^{2+}(aq)(0.1\,M)\,||\,Ag^+(aq)(0.01\,M)\,|\,Ag(s)} the cell potential E1=0.3095E_1=0.3095 V. For the cell Cu(s) ∣ Cu2+(aq)(0.01 M) ∣∣ Ag+(aq)(0.001 M) ∣ Ag(s)\mathrm{Cu(s)\,|\,Cu^{2+}(aq)(0.01\,M)\,||\,Ag^+(aq)(0.001\,M)\,|\,Ag(s)} the cell potential == ________ ×10−2\times10^{-2} V. (Round off to the Nearest Integer) [Use: 2.303RTF=0.059\dfrac{2.303RT}{F}=0.059]
Not attempted
Your answer: —
Correct answer: 28
222
[JEE Main 2021, 27 July Shift 2, Q51] In a solvent 50% of an acid HA dimerizes and the rest dissociates. The van't Hoff factor of the acid is ________ ×10−2\times10^{-2}. (Round off to the Nearest Integer)
Not attempted
Your answer: —
Correct answer: 125
223
[JEE Main 2021, 27 July Shift 2, Q31] Select the correct statements. (A) Crystalline solids have long range order. (B) Crystalline solids are isotropic. (C) Amorphous solids are sometimes called pseudo solids. (D) Amorphous solids soften over a range of temperatures. (E) Amorphous solids have a definite heat of fusion. Choose the most appropriate answer from the options given below:
Not attempted
A
(B), (D) only
B
(A), (B), (E) only
C
(A), (C), (D) only
D
(C), (D) only
224
[JEE Main 2021, 27 July Shift 2, Q48] Match List-I with List-II: List-I (compound)List-II (effect / affected species)(a) Carbon monoxide(i) Carcinogenic(b) Sulphur dioxide(ii) Metabolized by pyrus plants(c) Polychlorinated biphenyls(iii) Haemoglobin(d) Oxides of nitrogen(iv) Stiffness of flower buds\begin{array}{ll}\textbf{List-I (compound)} & \textbf{List-II (effect / affected species)} \\ \text{(a) Carbon monoxide} & \text{(i) Carcinogenic} \\ \text{(b) Sulphur dioxide} & \text{(ii) Metabolized by pyrus plants} \\ \text{(c) Polychlorinated biphenyls} & \text{(iii) Haemoglobin} \\ \text{(d) Oxides of nitrogen} & \text{(iv) Stiffness of flower buds} \end{array} Choose the correct answer from the options given below:
Not attempted
A
(a) - (iv), (b) - (i), (c) - (iii), (d) - (ii)
B
(a) - (i), (b) - (ii), (c) - (iii), (d) - (iv)
C
(a) - (iii), (b) - (iv), (c) - (ii), (d) - (i)
D
(a) - (iii), (b) - (iv), (c) - (i), (d) - (ii)
225
[JEE Main 2021, 27 July Shift 2, Q56] The dihedral angle in staggered form of the Newman projection of 1,1,1-trichloroethane is _____________ degree. (Round off to the Nearest Integer)
Not attempted
Your answer: —
Correct answer: 60
226
[JEE Main 2021, 27 July Shift 2, Q35] Given below are two statements: Statement I\textbf{Statement I}: Hyperconjugation is a permanent effect. Statement II\textbf{Statement II}: Hyperconjugation in the ethyl cation (CH3−C+H2)\left(\mathrm{CH_3-\overset{+}{C}H_2}\right) involves the overlapping of a Csp2−H1s\mathrm{Csp^2-H1s} bond with the empty 2p orbital of the other carbon. Choose the correct option:
Not attempted
A
Statement I is incorrect but Statement II is true.
B
Statement I is correct but Statement II is false.
C
Both Statement I and Statement II are false.
D
Both Statement I and Statement II are true.
227
[JEE Main 2021, 27 July Shift 2, Q41] Which one of the following sets of elements can be detected using the sodium fusion extract?
Not attempted
A
Halogens, Nitrogen, Oxygen, Sulfur
B
Sulfur, Nitrogen, Phosphorous, Halogens
C
Phosphorous, Oxygen, Nitrogen, Halogens
D
Nitrogen, Phosphorous, Carbon, Sulfur
228
[JEE Main 2021, 27 July Shift 2, Q50] Number of Cl=O\mathrm{Cl=O} bonds in chlorous acid, chloric acid and perchloric acid respectively are:
Not attempted
A
4, 1 and 0
B
1, 1 and 3
C
1, 2 and 3
D
3, 1 and 1
229
[JEE Main 2021, 27 July Shift 2, Q37] Match List-I with List-II: List-IList-II(a) Li(i) photoelectric cell(b) Na(ii) absorbent of CO2(c) K(iii) coolant in fast breeder nuclear reactor(d) Cs(iv) treatment of cancer(v) bearings for motor engines\begin{array}{ll}\textbf{List-I} & \textbf{List-II} \\ \text{(a) Li} & \text{(i) photoelectric cell} \\ \text{(b) Na} & \text{(ii) absorbent of CO}_2 \\ \text{(c) K} & \text{(iii) coolant in fast breeder nuclear reactor} \\ \text{(d) Cs} & \text{(iv) treatment of cancer} \\ & \text{(v) bearings for motor engines} \end{array} Choose the correct answer from the options given below:
Not attempted
A
(a) - (v), (b) - (ii), (c) - (iv), (d) - (i)
B
(a) - (iv), (b) - (iii), (c) - (i), (d) - (ii)
C
(a) - (v), (b) - (i), (c) - (ii), (d) - (iv)
D
(a) - (v), (b) - (iii), (c) - (ii), (d) - (i)
230
[JEE Main 2021, 27 July Shift 2, Q44] The number of neutrons and electrons respectively, present in the radioactive isotope of hydrogen is:
Not attempted
A
2 and 1
B
1 and 1
C
3 and 1
D
2 and 2
231
[JEE Main 2021, 27 July Shift 2, Q47] To an aqueous solution containing ions such as Al3+,Zn2+,Ca2+,Fe3+,Ni2+,Ba2+\mathrm{Al^{3+},Zn^{2+},Ca^{2+},Fe^{3+},Ni^{2+},Ba^{2+}} and Cu2+\mathrm{Cu^{2+}} was added conc. HCl, followed by H2S\mathrm{H_2S}. The total number of cations precipitated during this reaction is / are:
Not attempted
A
4
B
1
C
3
D
2
232
[JEE Main 2021, 27 July Shift 2, Q54] The equilibrium constant for the reaction A(s)⇌M(s)+12O2(g)\mathrm{A(s)\rightleftharpoons M(s)+\dfrac{1}{2}O_2(g)} is Kp=4K_p=4. At equilibrium, the partial pressure of O2\mathrm{O_2} is __________ atm. (Round off to the Nearest Integer)
Not attempted
Your answer: —
Correct answer: 16
233
[JEE Main 2021, 27 July Shift 2, Q59] When 400 mL of 0.2 M H2SO4\mathrm{H_2SO_4} solution is mixed with 600 mL of 0.1 M NaOH solution, the increase in temperature of the final solution is __________ ×10−2\times10^{-2} K. (Round off to the Nearest Integer) [Use: H+(aq)+OH−(aq)→H2O\mathrm{H^+(aq)+OH^-(aq)\rightarrow H_2O}: ΔH=−57.1 kJ mol−1\Delta H=-57.1\ \mathrm{kJ\,mol^{-1}}; specific heat of H2O=4.18 J K−1 g−1\mathrm{H_2O}=4.18\ \mathrm{J\,K^{-1}\,g^{-1}}; density of H2O=1.0 g cm−3\mathrm{H_2O}=1.0\ \mathrm{g\,cm^{-3}}. Assume no change in volume of solution on mixing.]
Not attempted
Your answer: —
Correct answer: 82
234
[JEE Main 2021, 27 July Shift 2, Q57] The total number of electrons in all bonding molecular orbitals of O22+\mathrm{O_2^{2+}} is __________. (Round off to the Nearest Integer)
Not attempted
Your answer: —
Correct answer: 10
235
[JEE Main 2021, 27 July Shift 2, Q45] The CORRECT order of first ionisation enthalpy is:
Not attempted
A
Mg<Al<S<P\mathrm{Mg<Al<S<P}
B
Al<Mg<S<P\mathrm{Al<Mg<S<P}
C
Mg<S<Al<P\mathrm{Mg<S<Al<P}
D
Mg<Al<P<S\mathrm{Mg<Al<P<S}
236
[JEE Main 2021, 27 July Shift 2, Q32] If the Thomson model of the atom was correct, then the result of Rutherford's gold foil experiment would have been:
Not attempted
A
All α\alpha particles get bounced back by 180∘180^\circ.
B
α\alpha particles are deflected over a wide range of angles.
C
All of α\alpha particles pass through the gold foil without decrease in speed.
D
α\alpha particles pass through the gold foil deflected by small angles and with reduced speed.
237
[JEE Main 2021, 27 July Shift 2, Q53] 2SO2(g)+O2(g)→2SO3(g)\mathrm{2SO_2(g)+O_2(g)\rightarrow 2SO_3(g)} The above reaction is carried out in a vessel starting with partial pressures PSO2=250P_{SO_2}=250 mbar, PO2=750P_{O_2}=750 mbar and PSO3=0P_{SO_3}=0 bar. When the reaction is complete, the total pressure in the reaction vessel is ____________ mbar. (Round off to the Nearest Integer)
Not attempted
Your answer: —
Correct answer: 875
238
[JEE Main 2021, 27 July Shift 2, Q60] 10.010.0 mL of 0.050.05 M KMnO4\mathrm{KMnO_4} solution was consumed in a titration with 10.010.0 mL of the given oxalic acid dihydrate solution. The strength of the given oxalic acid solution is ________ ×10−2\times10^{-2} g/L. (Round off to the Nearest Integer)
Not attempted
Your answer: —
Correct answer: 1575
239
[JEE Main 2021, 27 July Shift 1, Q38] Match List-I with List-II: List-I (Drug)List-II (Class of Drug)(a) Furacin(i) Antibiotic(b) Arsphenamine(ii) Tranquilizers(c) Dimetone(iii) Antiseptic(d) Valium(iv) Synthetic antihistamines\begin{array}{ll}\textbf{List-I (Drug)} & \textbf{List-II (Class of Drug)} \\ \text{(a) Furacin} & \text{(i) Antibiotic} \\ \text{(b) Arsphenamine} & \text{(ii) Tranquilizers} \\ \text{(c) Dimetone} & \text{(iii) Antiseptic} \\ \text{(d) Valium} & \text{(iv) Synthetic antihistamines} \end{array} Choose the most appropriate match:
Not attempted
A
(a) - (ii), (b) - (i), (c) - (iii), (d) - (iv)
B
(a) - (i), (b) - (iii), (c) - (iv), (d) - (ii)
C
(a) - (iii), (b) - (i), (c) - (iv), (d) - (ii)
D
(a) - (iii), (b) - (iv), (c) - (ii), (d) - (i)
240
[JEE Main 2021, 27 July Shift 1, Q33] Which one among the following chemical tests is used to distinguish monosaccharide from disaccharide?
Not attempted
A
Tollen's test
B
Seliwanoff's test
C
Iodine test
D
Barfoed test
241
[JEE Main 2021, 27 July Shift 1, Q43] The compound 'A' (see figure) is a complementary base of ____________ in DNA strands.
Not attempted
OONNHHHH3C
A
Adenine
B
Cytosine
C
Guanine
D
Uracil
242
[JEE Main 2021, 27 July Shift 1, Q50] Given below are two statements: Statement I\textbf{Statement I}: Aniline is less basic than acetamide. Statement II\textbf{Statement II}: In aniline, the lone pair of electrons on nitrogen atom is delocalised over benzene ring due to resonance and hence less available to a proton. Choose the most appropriate option:
Not attempted
A
Statement I is true but Statement II is false.
B
Statement I is false but Statement II is true.
C
Both Statement I and Statement II are true.
D
Both Statement I and Statement II are false.
243
[JEE Main 2021, 27 July Shift 1, Q36] Which one of the following compounds will give orange precipitate when treated with 2,4-dinitrophenylhydrazine?
Not attempted
A
Structure (A)\text{Structure (A)}
OOOH
B
Structure (B)\text{Structure (B)}
OO
C
Structure (C)\text{Structure (C)}
OOHOH
D
Structure (D)\text{Structure (D)}
O
244
[JEE Main 2021, 27 July Shift 1, Q37] Consider the given reaction (see figure): cyclohexylmethanol is heated with H3PO4\mathrm{H_3PO_4} at 120∘120^\circC to give the major product A, which is then treated with (BH3)2(\mathrm{BH_3})_2 followed by H2O2/O−H, H2O\mathrm{H_2O_2/\overset{-}{O}H,\ H_2O} to give the major product P. Identify the product P:
Not attempted
OHH3PO4120 °CA(Major Product)(BH3)2H2O2 / OH, H2OP(Major Product)
A
Structure (A)\text{Structure (A)}
OHOH
B
Structure (B)\text{Structure (B)}
CH3OH
C
Structure (C)\text{Structure (C)}
OH
D
Structure (D)\text{Structure (D)}
H3COH
245
[JEE Main 2021, 27 July Shift 1, Q35] The number of geometrical isomers found in the metal complexes [PtCl2(NH3)2][\mathrm{PtCl_2(NH_3)_2}], [Ni(CO)4][\mathrm{Ni(CO)_4}], [Ru(H2O)3Cl3][\mathrm{Ru(H_2O)_3Cl_3}] and [CoCl2(NH3)4]+[\mathrm{CoCl_2(NH_3)_4}]^+ respectively are:
Not attempted
A
2, 1, 2, 2
B
2, 0, 2, 2
C
1, 1, 1, 1
D
2, 1, 2, 1
246
[JEE Main 2021, 27 July Shift 1, Q41] The type of hybridisation and magnetic property of the complex [MnCl6]3−[\mathrm{MnCl_6}]^{3-}, respectively, are:
Not attempted
A
sp3d2sp^3d^2 and paramagnetic
B
d2sp3d^2sp^3 and paramagnetic
C
d2sp3d^2sp^3 and diamagnetic
D
sp3d2sp^3d^2 and diamagnetic
247
[JEE Main 2021, 27 July Shift 1, Q52] The number of geometrical isomers possible in triamminetrinitrocobalt(III) is X and in trioxalatochromate(III) is Y. Then the value of X + Y is ____________.
Not attempted
Your answer: —
Correct answer: 2
248
[JEE Main 2021, 27 July Shift 1, Q49] The statement that is INCORRECT about Ellingham diagram is:
Not attempted
A
Provides idea about the reaction rate.
B
Provides idea about changes in the phases during the reaction.
C
Provides idea about free energy change.
D
Provides idea about reduction of metal oxide.
249
[JEE Main 2021, 27 July Shift 1, Q56] CO2\mathrm{CO_2} gas adsorbs on charcoal following Freundlich adsorption isotherm. For a given amount of charcoal, the mass of CO2\mathrm{CO_2} adsorbed becomes 64 times when the pressure of CO2\mathrm{CO_2} is doubled. The value of nn in the Freundlich isotherm equation is ______ ×10−2\times10^{-2}. (Round off to the nearest integer)
Not attempted
Your answer: —
Correct answer: 17
250
[JEE Main 2021, 27 July Shift 1, Q32] For a reaction of order nn, the unit of the rate constant is:
Not attempted
A
mol1−n Ln−1 s−1\mathrm{mol^{1-n}\,L^{n-1}\,s^{-1}}
B
mol1−n L1−n s−1\mathrm{mol^{1-n}\,L^{1-n}\,s^{-1}}
C
mol1−n L2n s−1\mathrm{mol^{1-n}\,L^{2n}\,s^{-1}}
D
mol1−n L1−n s\mathrm{mol^{1-n}\,L^{1-n}\,s}
251
[JEE Main 2021, 27 July Shift 1, Q51] The conductivity of a weak acid HA of concentration 0.001 mol L−10.001\ \mathrm{mol\,L^{-1}} is 2.0×10−5 S cm−12.0\times10^{-5}\ \mathrm{S\,cm^{-1}}. If Λmo(HA)=190 S cm2 mol−1\Lambda_m^o(\mathrm{HA})=190\ \mathrm{S\,cm^2\,mol^{-1}}, the ionization constant (Ka)(K_a) of HA is equal to _______ ×10−6\times10^{-6}. (Round off to the nearest integer)
Not attempted
Your answer: —
Correct answer: 12
252
[JEE Main 2021, 27 July Shift 1, Q55] 1.46 g of a biopolymer dissolved in a 100 mL water at 300 K exerted an osmotic pressure of 2.42×10−32.42\times10^{-3} bar. The molar mass of the biopolymer is _________________ ×104 g mol−1\times10^{4}\ \mathrm{g\,mol^{-1}}. (Round off to the nearest integer) [Use: R=0.083 L bar mol−1 K−1R=0.083\ \mathrm{L\,bar\,mol^{-1}\,K^{-1}}]
Not attempted
Your answer: —
Correct answer: 15
253
[JEE Main 2021, 27 July Shift 1, Q59] The density of NaOH solution is 1.2 g cm−31.2\ \mathrm{g\,cm^{-3}}. The molality of this solution is ________ m. (Round off to the nearest integer) [Use: Atomic masses: Na 23.0 u, O 16.0 u, H 1.0 u; density of H2O\mathrm{H_2O}: 1.0 g cm−31.0\ \mathrm{g\,cm^{-3}}]
Not attempted
Your answer: —
Correct answer: 5
254
[JEE Main 2021, 27 July Shift 1, Q39] The parameters of the unit cell of a substance are a=2.5a=2.5, b=3.0b=3.0, c=4.0c=4.0, α=90∘\alpha=90^\circ, β=120∘\beta=120^\circ, γ=90∘\gamma=90^\circ. The crystal system of the substance is:
Not attempted
A
Monoclinic
B
Triclinic
C
Orthorhombic
D
Hexagonal
255
[JEE Main 2021, 27 July Shift 1, Q47] Which one of the following statements is NOT correct?
Not attempted
A
Eutrophication indicates that water body is polluted
B
Eutrophication leads to increase in the oxygen level in water
C
Eutrophication leads to anaerobic conditions
D
The dissolved oxygen concentration below 6 ppm inhibits fish growth
256
[JEE Main 2021, 27 July Shift 1, Q42] Presence of which reagent will affect the reversibility of the following reaction, and change it to an irreversible reaction: CH4+I2⇌hνCH3I+HI\mathrm{CH_4 + I_2 \overset{h\nu}{\rightleftharpoons} CH_3I + HI} (reversible)
Not attempted
A
HOCl
B
Liquid NH3\mathrm{NH_3}
C
Dilute HNO2\mathrm{HNO_2}
D
Concentrated HIO3\mathrm{HIO_3}
257
[JEE Main 2021, 27 July Shift 1, Q34] Staggered and eclipsed conformers of ethane are:
Not attempted
A
Mirror images
B
Polymers
C
Enantiomers
D
Rotamers
258
[JEE Main 2021, 27 July Shift 1, Q45] The stability of the given carbocations (see figure) is to be compared. The correct order of stability is:
Not attempted
CH2ACH2=CHBH3C—CH2CHC≡CD
A
A > C > B > D
B
D > B > C > A
C
C > A > D > B
D
D > B > A > C
259
[JEE Main 2021, 27 July Shift 1, Q54] An organic compound is subjected to chlorination to get compound A using 5.0 g of chlorine. When 0.5 g of compound A is reacted with AgNO3\mathrm{AgNO_3} [Carius Method], the percentage of chlorine in compound A is _________ when it forms 0.3849 g of AgCl. (Round off to the nearest integer) (Atomic masses of Ag and Cl are 107.87 and 35.5 respectively)
Not attempted
Your answer: —
Correct answer: 19
260
[JEE Main 2021, 27 July Shift 1, Q40] The oxidation states of 'P' in H4P2O7\mathrm{H_4P_2O_7}, H4P2O5\mathrm{H_4P_2O_5} and H4P2O6\mathrm{H_4P_2O_6}, respectively are:
Not attempted
A
5, 3 and 4
B
5, 4 and 3
C
6, 4 and 5
D
7, 5 and 6
261
[JEE Main 2021, 27 July Shift 1, Q48] The product obtained from the electrolytic oxidation of acidified sulphate solutions, is:
Not attempted
A
HO3SOSO3H\mathrm{HO_3SOSO_3H}
B
HSO4−\mathrm{HSO_4^-}
C
HO2SOSO2H\mathrm{HO_2SOSO_2H}
D
HO3SOOSO3H\mathrm{HO_3SOOSO_3H}
262
[JEE Main 2021, 27 July Shift 1, Q44] Match List-I with List-II: List-IList-II(a) NaOH(i) Acidic(b) Be(OH)2(ii) Basic(c) Ca(OH)2(iii) Amphoteric(d) B(OH)3(e) Al(OH)3\begin{array}{ll}\textbf{List-I} & \textbf{List-II} \\ \text{(a) NaOH} & \text{(i) Acidic} \\ \text{(b) Be(OH)}_2 & \text{(ii) Basic} \\ \text{(c) Ca(OH)}_2 & \text{(iii) Amphoteric} \\ \text{(d) B(OH)}_3 & \\ \text{(e) Al(OH)}_3 & \end{array} Choose the most appropriate answer from the options given below:
Not attempted
A
(a) - (ii), (b) - (i), (c) - (ii), (d) - (iii), (e) - (iii)
B
(a) - (ii), (b) - (iii), (c) - (ii), (d) - (i), (e) - (iii)
C
(a) - (ii), (b) - (ii), (c) - (iii), (d) - (ii), (e) - (iii)
D
(a) - (ii), (b) - (ii), (c) - (iii), (d) - (i), (e) - (iii)
263
[JEE Main 2021, 27 July Shift 1, Q57] PCl5⇌PCl3+Cl2\mathrm{PCl_5 \rightleftharpoons PCl_3 + Cl_2}, KC=1.844K_C=1.844 3.0 moles of PCl5\mathrm{PCl_5} is introduced in a 1 L closed reaction vessel at 380 K. The number of moles of PCl5\mathrm{PCl_5} at equilibrium is ________ ×10−3\times10^{-3}. (Round off to the nearest integer)
Not attempted
Your answer: —
Correct answer: 1396
264
[JEE Main 2021, 27 July Shift 1, Q60] For water at 100∘100^\circC and 1 bar, ΔvapH−ΔvapU=\Delta_{vap}H-\Delta_{vap}U= ______ ×102 J mol−1\times10^{2}\ \mathrm{J\,mol^{-1}}. (Round off to the nearest integer) [Use: R=8.31 J mol−1 K−1R=8.31\ \mathrm{J\,mol^{-1}\,K^{-1}}] [Assume volume of H2O(l)\mathrm{H_2O(l)} is much smaller than volume of H2O(g)\mathrm{H_2O(g)}. Assume H2O(g)\mathrm{H_2O(g)} can be treated as an ideal gas]
Not attempted
Your answer: —
Correct answer: 31
265
[JEE Main 2021, 27 July Shift 1, Q46] Given below are two statements: One is labelled as Assertion A\textbf{Assertion A} and the other is labelled as Reason R\textbf{Reason R}. Assertion A\textbf{Assertion A}: Lithium halides are somewhat covalent in nature. Reason R\textbf{Reason R}: Lithium possesses high polarisation capability. In the light of the above statements, choose the most appropriate answer from the options given below:
Not attempted
A
A is true but R is false
B
Both A and R are true but R is NOT the correct explanation of A
C
A is false but R is true
D
Both A and R are true and R is the correct explanation of A
266
[JEE Main 2021, 27 July Shift 1, Q53] In gaseous triethyl amine the "C−N−C\mathrm{C-N-C}" bond angle is __________ degree.
Not attempted
Your answer: —
Correct answer: 108
267
[JEE Main 2021, 27 July Shift 1, Q58] The difference between bond orders of CO and NO+\mathrm{NO^+} is x2\dfrac{x}{2} where x=x= _________ (Round off to the nearest integer)
Not attempted
Your answer: —
Correct answer: 0
268
[JEE Main 2021, 27 July Shift 1, Q31] Given below are two statements: Statement I\textbf{Statement I}: Rutherford's gold foil experiment cannot explain the line spectrum of hydrogen atom. Statement II\textbf{Statement II}: Bohr's model of hydrogen atom contradicts Heisenberg's uncertainty principle. In the light of the above statements, choose the most appropriate answer from the options given below:
Not attempted
A
Statement I is true but Statement II is false.
B
Both Statement I and Statement II are false.
C
Both Statement I and Statement II are true.
D
Statement I is false but Statement II is true.
269
[JEE Main 2021, 25 July Shift 2, Q44] A biodegradable polyamide can be made from:
Not attempted
A
Glycine and aminocaproic acid
B
Hexamethylene diamine and adipic acid
C
Glycine and isoprene
D
Styrene and caproic acid
270
[JEE Main 2021, 25 July Shift 2, Q42] Which one of the following is correct structure for cytosine?
Not attempted
A
Structure (A)\text{Structure (A)}
NNHOH3C
B
Structure (B)\text{Structure (B)}
NNHOH2N
C
Structure (C)\text{Structure (C)}
NNHOHOH3C
D
Structure (D)\text{Structure (D)}
NNHONH2
271
[JEE Main 2021, 25 July Shift 2, Q46] C6H5NO2→ Sn+HCl A→ H+  C6H5N2+Cl− P (yellow coloured compound)\mathrm{C_6H_5NO_2}\xrightarrow{\ \mathrm{Sn+HCl}\ }\text{A}\xrightarrow[\ \mathrm{H^+}\ ]{\ \mathrm{C_6H_5N_2^+Cl^-}\ }\text{P (yellow coloured compound)} Consider the above reaction, the product "P" is:
Not attempted
A
Structure (A)\text{Structure (A)}
NNNH2
B
Structure (B)\text{Structure (B)}
NNNH2
C
Structure (C)\text{Structure (C)}
NH
D
Structure (D)\text{Structure (D)}
NNNH
272
[JEE Main 2021, 25 July Shift 2, Q48] What is the major product "P" of the following reaction? (i) NaNO2, HCl, 278 K\mathrm{(i)\ NaNO_2,\ HCl,\ 278\ K} followed by (ii) H2O\mathrm{(ii)\ H_2O} gives P (major product). The starting material is shown in the figure.
Not attempted
CH3NH2
A
Structure (A)\text{Structure (A)}
CH3CH3
B
Structure (B)\text{Structure (B)}
CH3Cl
C
Structure (C)\text{Structure (C)}
OHN2Cl
D
Structure (D)\text{Structure (D)}
CH3OH
273
[JEE Main 2021, 25 July Shift 2, Q32] Maleic anhydride (structure shown in the figure) can be prepared by:
Not attempted
OOOMaleic anhydride
A
Heating cis-but-2-enedioic acid
B
Treating cis-but-2-enedioic acid with alcohol and acid
C
Heating trans-but-2-enedioic acid
D
Treating trans-but-2-enedioic acid with alcohol and acid
274
[JEE Main 2021, 25 July Shift 2, Q39] In the figure, bromoacetaldehyde is treated first with excess ethanol and dry HCl gas to give "A" (major product), which is then treated with t-BuO−K+\mathrm{t\text{-}BuO^-K^+} to give "B" (major product). [where Et⇒C2H5\mathrm{Et \Rightarrow C_2H_5}, t-Bu⇒(CH3)3C−\mathrm{t\text{-}Bu \Rightarrow (CH_3)_3C-}] Consider the above reaction sequence, product "A" and product "B" formed respectively are:
Not attempted
BrCHOEtOH excessdry HCl gas"A"(major product)t-BuO⁻ K⁺"B"(major product)
A
Structure (A)\text{Structure (A)}
EtOCHO,EtOOtBuOH
B
Structure (B)\text{Structure (B)}
BrOEtOEt,tBuOOEtOEt
C
Structure (C)\text{Structure (C)}
BrOEtOEt,H2COEtOEt
D
Structure (D)\text{Structure (D)}
EtOOEtOEt,H2COEtOEt
275
[JEE Main 2021, 25 July Shift 2, Q50] A reaction of benzonitrile with one equivalent CH3MgBr\mathrm{CH_3MgBr} followed by hydrolysis produces a yellow liquid "P". The compound "P" will give positive ______.
Not attempted
A
Iodoform test
B
Schiff's test
C
Ninhydrin's test
D
Tollen's test
276
[JEE Main 2021, 25 July Shift 2, Q47] The correct decreasing order of densities of the following compounds is: (A) benzene, (B) chlorobenzene, (C) 1,3-dichlorobenzene, (D) 1-bromo-3-chlorobenzene (structures shown in the figure).
Not attempted
(A)Cl(B)ClCl(C)BrCl(D)
A
(C) > (B) > (A) > (D)
B
(A) > (B) > (C) > (D)
C
(D) > (C) > (B) > (A)
D
(C) > (D) > (A) > (B)
277
[JEE Main 2021, 25 July Shift 2, Q35] Which one of the following metal complexes is most stable?
Not attempted
A
[Co(en)2(NH3)2]Cl2\mathrm{[Co(en)_2(NH_3)_2]Cl_2}
B
[Co(NH3)6]Cl2\mathrm{[Co(NH_3)_6]Cl_2}
C
[Co(en)3]Cl2\mathrm{[Co(en)_3]Cl_2}
D
[Co(en)(NH3)4]Cl2\mathrm{[Co(en)(NH_3)_4]Cl_2}
278
[JEE Main 2021, 25 July Shift 2, Q34] The spin only magnetic moments (in BM) for free Ti3+\mathrm{Ti^{3+}}, V2+\mathrm{V^{2+}} and Sc3+\mathrm{Sc^{3+}} ions respectively are (At. No. Sc: 21; Ti: 22; V: 23)
Not attempted
A
1.73, 0, 3.871.73,\ 0,\ 3.87
B
0, 3.87, 1.730,\ 3.87,\ 1.73
C
3.87, 1.73, 03.87,\ 1.73,\ 0
D
1.73, 3.87, 01.73,\ 3.87,\ 0
279
[JEE Main 2021, 25 July Shift 2, Q54] Number of electrons present in 4f4f orbital of Ho3+\mathrm{Ho^{3+}} ion is ______. (Given atomic number of Ho = 67)
Not attempted
Your answer: —
Correct answer: 10
280
[JEE Main 2021, 25 July Shift 2, Q45] Match List - I with List - II: List-IList-II(a) Concentration of Ag ore(i) Reverberatory furnace(b) Blast furnace(ii) Pig iron(c) Blister copper(iii) Leaching with dilute NaCN solution(d) Froth floatation method(iv) Sulfide ores\displaystyle\begin{array}{ll}\textbf{List-I} & \textbf{List-II} \\ \text{(a) Concentration of Ag ore} & \text{(i) Reverberatory furnace} \\ \text{(b) Blast furnace} & \text{(ii) Pig iron} \\ \text{(c) Blister copper} & \text{(iii) Leaching with dilute NaCN solution} \\ \text{(d) Froth floatation method} & \text{(iv) Sulfide ores}\end{array} Choose the correct answer from the options given below:
Not attempted
A
(a) - (iii), (b) - (ii), (c) - (i), (d) - (iv)
B
(a) - (iii), (b) - (iv), (c) - (i), (d) - (ii)
C
(a) - (iv), (b) - (i), (c) - (iii), (d) - (ii)
D
(a) - (iv), (b) - (iii), (c) - (ii), (d) - (i)
281
[JEE Main 2021, 25 July Shift 2, Q38] Match List - I with List - II: List-I (Example of Colloids)List-II (Classification)(a) Cheese(i) dispersion of liquid in liquid(b) Pumice stone(ii) dispersion of liquid in gas(c) Hair cream(iii) dispersion of gas in solid(d) Cloud(iv) dispersion of liquid in solid\displaystyle\begin{array}{ll}\textbf{List-I (Example of Colloids)} & \textbf{List-II (Classification)} \\ \text{(a) Cheese} & \text{(i) dispersion of liquid in liquid} \\ \text{(b) Pumice stone} & \text{(ii) dispersion of liquid in gas} \\ \text{(c) Hair cream} & \text{(iii) dispersion of gas in solid} \\ \text{(d) Cloud} & \text{(iv) dispersion of liquid in solid}\end{array} Choose the most appropriate answer from the option given below:
Not attempted
A
(a) - (iii), (b) - (iv), (c) - (i), (d) - (ii)
B
(a) - (iv), (b) - (iii), (c) - (ii), (d) - (i)
C
(a) - (iv), (b) - (iii), (c) - (i), (d) - (ii)
D
(a) - (iv), (b) - (i), (c) - (iii), (d) - (ii)
282
[JEE Main 2021, 25 July Shift 2, Q57] For a chemical reaction A→B\mathrm{A\rightarrow B}, it was found that concentration of B is increased by 0.20.2 mol L−1\mathrm{L^{-1}} in 3030 min. The average rate of the reaction is ______ ×10−1\times10^{-1} mol L−1 h−1\mathrm{L^{-1}\,h^{-1}}. (in nearest integer)
Not attempted
Your answer: —
Correct answer: 4
283
[JEE Main 2021, 25 July Shift 2, Q58] When 3.003.00 g of substance X is dissolved in 100100 g of CCl4\mathrm{CCl_4}, it raises the boiling point by 0.600.60 K. The molar mass of the substance X is ______ g mol−1\mathrm{mol^{-1}}. (nearest integer) [Given KbK_b for CCl4\mathrm{CCl_4} is 5.05.0 K kg mol−1\mathrm{mol^{-1}}]
Not attempted
Your answer: —
Correct answer: 250
284
[JEE Main 2021, 25 July Shift 2, Q31] Given below are two statements: Statement I\textbf{Statement I}: Chlorofluoro carbons breakdown by radiation in the visible energy region and release chlorine gas in the atmosphere which then reacts with stratospheric ozone. Statement II\textbf{Statement II}: Atmospheric ozone reacts with nitric oxide to give nitrogen and oxygen gases, which add to the atmosphere. For the above statements choose the correct answer from the options given below:
Not attempted
A
Statement I is incorrect but Statement II is true
B
Both Statement I and II are correct
C
Both Statement I and II are false
D
Statement I is correct but Statement II is false
285
[JEE Main 2021, 25 July Shift 2, Q55] The alkene shown in the figure (cis-but-2-ene) reacts with Br2\mathrm{Br_2} in CCl4\mathrm{CCl_4} to give product "P". Consider the above chemical reaction. The total number of stereoisomers possible for product "P" is ______.
Not attempted
H3CHH3CH+ Br₂CCl₄Product "P"
Your answer: —
Correct answer: 2
286
[JEE Main 2021, 25 July Shift 2, Q40] Which among the following is the strongest acid?
Not attempted
A
CH3CH2CH2CH3\mathrm{CH_3CH_2CH_2CH_3}
B
Structure (B)\text{Structure (B)}
C
Structure (C)\text{Structure (C)}
D
Structure (D)\text{Structure (D)}
287
[JEE Main 2021, 25 July Shift 2, Q60] 0.80.8 g of an organic compound was analysed by Kjeldahl's method for the estimation of nitrogen. If the percentage of nitrogen in the compound was found to be 42%42\%, then ______ mL of 11 M H2SO4\mathrm{H_2SO_4} would have been neutralized by the ammonia evolved during the analysis.
Not attempted
Your answer: —
Correct answer: 12
288
[JEE Main 2021, 25 July Shift 2, Q36] Match List - I with List - II: List-I (Elements)List-II (Properties)(a) Li(i) Poor water solubility of I− salt(b) Na(ii) Most abundant element in cell fluid(c) K(iii) Bicarbonate salt used in fire extinguisher(d) Cs(iv) Carbonate salt decomposes easily on heating\displaystyle\begin{array}{ll}\textbf{List-I (Elements)} & \textbf{List-II (Properties)} \\ \text{(a) Li} & \text{(i) Poor water solubility of } \mathrm{I^-} \text{ salt} \\ \text{(b) Na} & \text{(ii) Most abundant element in cell fluid} \\ \text{(c) K} & \text{(iii) Bicarbonate salt used in fire extinguisher} \\ \text{(d) Cs} & \text{(iv) Carbonate salt decomposes easily on heating}\end{array} Choose the correct answer from the options given below:
Not attempted
A
(a) - (iv), (b) - (ii), (c) - (iii), (d) - (i)
B
(a) - (i), (b) - (ii), (c) - (iii), (d) - (iv)
C
(a) - (i), (b) - (iii), (c) - (ii), (d) - (iv)
D
(a) - (iv), (b) - (iii), (c) - (ii), (d) - (i)
289
[JEE Main 2021, 25 July Shift 2, Q41] Which one of the following metals forms interstitial hydride easily?
Not attempted
A
Fe
B
Cr
C
Mn
D
Co
290
[JEE Main 2021, 25 July Shift 2, Q49] Identify the process in which change in the oxidation state is five:
Not attempted
A
CrO42−→Cr3+\mathrm{CrO_4^{2-} \rightarrow Cr^{3+}}
B
MnO4−→Mn2+\mathrm{MnO_4^- \rightarrow Mn^{2+}}
C
Cr2O72−→2Cr3+\mathrm{Cr_2O_7^{2-} \rightarrow 2Cr^{3+}}
D
C2O42−→2CO2\mathrm{C_2O_4^{2-} \rightarrow 2CO_2}
291
[JEE Main 2021, 25 July Shift 2, Q56] Assuming that Ba(OH)2\mathrm{Ba(OH)_2} is completely ionized in aqueous solution under the given conditions the concentration of H3O+\mathrm{H_3O^+} ions in 0.0050.005 M aqueous solution of Ba(OH)2\mathrm{Ba(OH)_2} at 298298 K is ______ ×10−12\times10^{-12} mol L−1\mathrm{L^{-1}}. (nearest integer)
Not attempted
Your answer: —
Correct answer: 1
292
[JEE Main 2021, 25 July Shift 2, Q59] A system does 200200 J of work and at the same time absorbs 150150 J of heat. The magnitude of the change in internal energy is ______ J. (Nearest integer)
Not attempted
Your answer: —
Correct answer: 50
293
[JEE Main 2021, 25 July Shift 2, Q52] An LPG cylinder contains gas at a pressure of 300300 kPa at 27∘C27^\circ\mathrm{C}. The cylinder can withstand the pressure of 1.2×1061.2\times10^{6} Pa. The room in which the cylinder is kept catches fire. The minimum temperature at which the bursting of cylinder will take place is ______ ∘C^\circ\mathrm{C}. (Nearest integer)
Not attempted
Your answer: —
Correct answer: 927
294
[JEE Main 2021, 25 July Shift 2, Q37] In the following the correct bond order sequence is:
Not attempted
A
O2>O2−>O22−>O2+\mathrm{O_2 > O_2^- > O_2^{2-} > O_2^+}
B
O2+>O2>O2−>O22−\mathrm{O_2^+ > O_2 > O_2^- > O_2^{2-}}
C
O22−>O2+>O2−>O2\mathrm{O_2^{2-} > O_2^+ > O_2^- > O_2}
D
O2+>O2−>O22−>O2\mathrm{O_2^+ > O_2^- > O_2^{2-} > O_2}
295
[JEE Main 2021, 25 July Shift 2, Q43] Identify the species having one π\pi-bond and maximum number of canonical forms from the following:
Not attempted
A
SO2\mathrm{SO_2}
B
CO32−\mathrm{CO_3^{2-}}
C
O2\mathrm{O_2}
D
SO3\mathrm{SO_3}
296
[JEE Main 2021, 25 July Shift 2, Q33] The ionic radii of F−\mathrm{F^-} and O2−\mathrm{O^{2-}} respectively are 1.33 A˚1.33\ \text{\AA} and 1.4 A˚1.4\ \text{\AA}, while the covalent radius of N is 0.74 A˚0.74\ \text{\AA}. The correct statement for the ionic radius of N3−\mathrm{N^{3-}} from the following is:
Not attempted
A
It is smaller than O2−\mathrm{O^{2-}} and F−\mathrm{F^-}, but bigger than of N
B
It is bigger than F−\mathrm{F^-} and N, but smaller than of O2−\mathrm{O^{2-}}
C
It is smaller than F−\mathrm{F^-} and N
D
It is bigger than O2−\mathrm{O^{2-}} and F−\mathrm{F^-}
297
[JEE Main 2021, 25 July Shift 2, Q53] An accelerated electron has speed of 5×106 ms−15\times10^{6}\ \mathrm{ms^{-1}} with an uncertainty of 0.02%0.02\%. The uncertainty in finding its location while in motion is x×10−9x\times10^{-9} m. The value of xx is ______. (Nearest integer) [Use mass of electron =9.1×10−31=9.1\times10^{-31} kg, h=6.63×10−34h=6.63\times10^{-34} Js, π=3.14\pi=3.14]
Not attempted
Your answer: —
Correct answer: 58
298
[JEE Main 2021, 25 July Shift 2, Q51] The number of significant figure in 0.003400.00340 is ______.
Not attempted
Your answer: —
Correct answer: 3
299
[JEE Main 2021, 25 July Shift 1, Q39] The structure shown in the figure (a repeating unit made of two phenol rings, each carrying −OH\mathrm{-OH}, joined through −CH2−\mathrm{-CH_2-} groups at the positions ortho to −OH\mathrm{-OH}) is a repeating unit for
Not attempted
OHOHCH2CH2CH2n
A
Neoprene
B
Novolac
C
Buna-N
D
Acrilan
300
[JEE Main 2021, 25 July Shift 1, Q41] The water soluble protein is:
Not attempted
A
Myosin
B
Collagen
C
Fibrin
D
Albumin
301
[JEE Main 2021, 25 July Shift 1, Q33] Given below are two statements, one is labelled as Assertion (A) and other is labelled as Reason (R). Assertion (A): Gabriel phthalimide synthesis cannot be used to prepare aromatic primary amines. Reason (R): Aryl halides do not undergo nucleophilic substitution reaction. In the light of the above statements, choose the correct answer from the options given below:
Not attempted
A
Both (A) and (R) are true and (R) is correct explanation of (A).
B
(A) is false but (R) is true.
C
(A) is true but (R) is false
D
Both (A) and (R) are true but (R) is not the correct explanation of (A).
302
[JEE Main 2021, 25 July Shift 1, Q43] Which one of the following compounds will liberate CO2\mathrm{CO_2}, when treated with NaHCO3\mathrm{NaHCO_3}?
Not attempted
A
(CH3)4N+ OH−\mathrm{(CH_3)_4N^+\ OH^-}
B
CH3NH2\mathrm{CH_3NH_2}
C
(CH3)3NH+ Cl−\mathrm{(CH_3)_3NH^+\ Cl^-}
D
CH3CONH2\mathrm{CH_3CONH_2}
303
[JEE Main 2021, 25 July Shift 1, Q49] Which one of the products of the following reactions does not react with Hinsberg reagent to form sulphonamide? (The four reactions (A) to (D) are shown in the figures of the options.)
Not attempted
A
Structure (A)\text{Structure (A)}
CNCH3+ H2 / Ni
B
Structure (B)\text{Structure (B)}
CNCHO+ LiAlH4H3O+
C
Structure (C)\text{Structure (C)}
CNNO2+ Na / HgC2H5OH
D
Structure (D)\text{Structure (D)}
CN+ SnCl2 + HCl
304
[JEE Main 2021, 25 July Shift 1, Q32] Consider the given reaction (see figure): 2,2-dimethylcyclopentanone is treated with CH3CHO\mathrm{CH_3CHO} / NaOH to give the major product P, which is then treated with (i) I2\mathrm{I_2} / NaOH, filtered, and (ii) the filtrate is treated with HCl to give X. The product X is:
Not attempted
OCH3CHONaOH'P'(Major Product)(i) I2 / NaOH. Filter(ii) Filtrate + HCl'X'
A
Structure (A)\text{Structure (A)}
OHCHO
B
Structure (B)\text{Structure (B)}
OOH
C
Structure (C)\text{Structure (C)}
OOOH
D
Structure (D)\text{Structure (D)}
OO
305
[JEE Main 2021, 25 July Shift 1, Q37] Consider the reaction shown in the figure: methyl vinyl ketone (CH2=CH−CO−CH3\mathrm{CH_2{=}CH{-}CO{-}CH_3}) treated with (i) C2H5MgBr\mathrm{C_2H_5MgBr}, dry ether and (ii) H2O\mathrm{H_2O}, HCl. The major product 'P' is:
Not attempted
O(i) C2H5MgBr, dry ether(ii) H2O, HClP(Major Product)
A
Structure (A)\text{Structure (A)}
ClOH
B
Structure (B)\text{Structure (B)}
OH
C
Structure (C)\text{Structure (C)}
ClOH
D
Structure (D)\text{Structure (D)}
OH
306
[JEE Main 2021, 25 July Shift 1, Q31] The given reaction (phenol to the para-bromo compound, shown in the figure) can occur in the presence of: (a) Bromine water (b) Br2\mathrm{Br_2} in CS2\mathrm{CS_2}, 273 K (c) Br2/FeBr3\mathrm{Br_2/FeBr_3} (d) Br2\mathrm{Br_2} in CHCl3\mathrm{CHCl_3}, 273 K Choose the correct answer from the options given below:
Not attempted
OHOHBr(Major Product)
A
(a) and (c) only
B
(b), (c) and (d) only
C
(b) and (d) only
D
(a), (b) and (d) only
307
[JEE Main 2021, 25 July Shift 1, Q42] Which one of the following species responds to an external magnetic field?
Not attempted
A
[Co(CN)6]3−[\mathrm{Co(CN)_6}]^{3-}
B
[Ni(CN)4]2−[\mathrm{Ni(CN)_4}]^{2-}
C
[Ni(CO)4][\mathrm{Ni(CO)_4}]
D
[Fe(H2O)6]3+[\mathrm{Fe(H_2O)_6}]^{3+}
308
[JEE Main 2021, 25 July Shift 1, Q60] Three moles of AgCl get precipitated when one mole of an octahedral co-ordination compound with empirical formula CrCl3⋅3NH3⋅3H2O\mathrm{CrCl_3{\cdot}3NH_3{\cdot}3H_2O} reacts with excess of silver nitrate. The number of chloride ions satisfying the secondary valency of the metal ion is__________.
Not attempted
Your answer: —
Correct answer: 0
309
[JEE Main 2021, 25 July Shift 1, Q45] The correct order of following 3d metal oxides, according to their oxidation numbers is: (a) CrO3\mathrm{CrO_3} (b) Fe2O3\mathrm{Fe_2O_3} (c) MnO2\mathrm{MnO_2} (d) V2O5\mathrm{V_2O_5} (e) Cu2O\mathrm{Cu_2O}
Not attempted
A
(a) > (d) > (c) > (b) > (e)
B
(c) > (a) > (d) > (e) > (b)
C
(d) > (a) > (b) > (c) > (e)
D
(a) > (c) > (d) > (b) > (e)
310
[JEE Main 2021, 25 July Shift 1, Q38] In the leaching of alumina from bauxite, the ore expected to leach out in the process by reacting with NaOH is:
Not attempted
A
ZnO\mathrm{ZnO}
B
Fe2O3\mathrm{Fe_2O_3}
C
SiO2\mathrm{SiO_2}
D
TiO2\mathrm{TiO_2}
311
[JEE Main 2021, 25 July Shift 1, Q46] Sodium stearate CH3(CH2)16COO−Na+\mathrm{CH_3(CH_2)_{16}COO^-Na^+} is an anionic surfactant which forms micelles in oil. Choose the correct statement for it from the following:
Not attempted
A
It forms spherical micelles with CH3(CH2)16−\mathrm{CH_3(CH_2)_{16}-} group pointing outwards on the surface of sphere.
B
It forms non-spherical micelles with −COO−\mathrm{-COO^-} group pointing outwards on the surface
C
It forms spherical miclelles with CH3(CH2)16−\mathrm{CH_3(CH_2)_{16}-} group pointing towards the centre of sphere.
D
It forms non-spherical micelles with CH3(CH2)16−\mathrm{CH_3(CH_2)_{16}-} group pointing towards the centre.
312
[JEE Main 2021, 25 July Shift 1, Q47] For the graphs shown in the figure, (a) rate vs time, (b) t1/2t_{1/2} vs initial concentration, (c) concentration vs time (decaying curve), (d) concentration vs time (horizontal line), (e) rate vs concentration (straight line through the origin). Choose from the options given below, the correct one regarding order of reaction is:
Not attempted
RateTime(a)t1/2Initial concentration(b)concentrationTime(c)concentrationTime(d)RateConcentration(e)
A
(a) and (b) zero order (e) First order
B
(b) and (d) zero order (e) First order
C
(a) and (b) zero order (c) and (e) First order
D
(b) zero order (c) and (e) First order
313
[JEE Main 2021, 25 July Shift 1, Q56] Consider the cell at 25∘25^\circC Zn ∣ Zn2+(aq), (1 M) ∣∣ Fe3+(aq), Fe2+(aq) ∣ Pt(s)\mathrm{Zn\ |\ Zn^{2+}(aq),\ (1\ M)\ ||\ Fe^{3+}(aq),\ Fe^{2+}(aq)\ |\ Pt(s)} The fraction of total iron present as Fe3+\mathrm{Fe^{3+}} ion at the cell potential of 1.500 V is x×10−2x\times10^{-2}. The value of xx is _____. (Nearest integer) (Given: EFe3+/Fe2+0=0.77E^0_{Fe^{3+}/Fe^{2+}} = 0.77 V, EZn2+/Zn0=−0.76E^0_{Zn^{2+}/Zn} = -0.76 V)
Not attempted
Your answer: —
Correct answer: 24
314
[JEE Main 2021, 25 July Shift 1, Q54] CO2\mathrm{CO_2} gas is bubbled through water during a soft drink manufacturing process at 298 K. If CO2\mathrm{CO_2} exerts a partial pressure of 0.835 bar then xx m mol of CO2\mathrm{CO_2} would dissolve in 0.9 L of water. The value of xx is __________ (Nearest integer) (Henry's law constant for CO2\mathrm{CO_2} at 298 K is 1.67×1031.67\times10^{3} bar)
Not attempted
Your answer: —
Correct answer: 25
315
[JEE Main 2021, 25 July Shift 1, Q48] Which one of the following chemical agent is not being used for dry-cleaning of clothes?
Not attempted
A
CCl4\mathrm{CCl_4}
B
Cl2C=CCl2\mathrm{Cl_2C{=}CCl_2}
C
Liquid CO2\mathrm{CO_2}
D
H2O2\mathrm{H_2O_2}
316
[JEE Main 2021, 25 July Shift 1, Q35] An organic compound 'A' C4H8\mathrm{C_4H_8} on treatment with KMnO4/H+\mathrm{KMnO_4/H^+} yields compound 'B' C3H6O\mathrm{C_3H_6O}. Compound 'A' also yields compound 'B' on ozonolysis. Compound 'A' is:
Not attempted
A
2-Methylpropene
B
1-Methylcyclopropane
C
Cyclobutane
D
But-2-ene
317
[JEE Main 2021, 25 July Shift 1, Q44] Which one among the following resonating structure is not correct?
Not attempted
A
Structure (A)\text{Structure (A)}
NOO
B
Structure (B)\text{Structure (B)}
NOO
C
Structure (C)\text{Structure (C)}
NOO
D
Structure (D)\text{Structure (D)}
NOO
318
[JEE Main 2021, 25 July Shift 1, Q36] Which one of the following compounds of Group-14 elements is not known?
Not attempted
A
[GeCl6]2−[\mathrm{GeCl_6}]^{2-}
B
[Sn(OH)6]2−[\mathrm{Sn(OH)_6}]^{2-}
C
[SiF6]2−[\mathrm{SiF_6}]^{2-}
D
[SiCl6]2−[\mathrm{SiCl_6}]^{2-}
319
[JEE Main 2021, 25 July Shift 1, Q50] Given below are two statements: Statement I: None of the alkaline earth metal hydroxides dissolves in alkali. Statement II: Solubility of alkaline earth metal hydroxides in water increases down the group. In the light of the above statements, choose the most appropriate answer from the options given below:
Not attempted
A
Statement I and Statement II both are incorrect.
B
Statement I is incorrect but Statement II is correct.
C
Statement I is correct but Statement II is incorrect.
D
Statement I and Statement II both are correct.
320
[JEE Main 2021, 25 July Shift 1, Q34] At 298.2 K the relationship between enthalpy of bond dissociation (in kJ mol−1\mathrm{kJ\ mol^{-1}}) for hydrogen (EHE_H) and its isotope, deuterium (EDE_D), is best described by:
Not attempted
A
EH=EDE_H = E_D
B
EH=12EDE_H = \frac{1}{2}E_D
C
EH=2EDE_H = 2E_D
D
EH=ED−7.5E_H = E_D - 7.5
321
[JEE Main 2021, 25 July Shift 1, Q55] When 10 mL of an aqueous solution of Fe2+\mathrm{Fe^{2+}} ions was titrated in the presence of dil H2SO4\mathrm{H_2SO_4} using diphenylamine indicator, 15 mL of 0.02 M solution of K2Cr2O7\mathrm{K_2Cr_2O_7} was required to get the end point. The molarity of the solution containing Fe2+\mathrm{Fe^{2+}} ions is x×10−2x\times10^{-2} M. The value of xx is ___. (Nearest integer)
Not attempted
Your answer: —
Correct answer: 18
322
[JEE Main 2021, 25 July Shift 1, Q57] For the reaction A+B⇌2C\mathrm{A + B \rightleftharpoons 2C} The value of equilibrium constant is 100 at 298 K. If the initial concentration of all the three species is 1 M each, then the equilibrium concentration of C is x×10−1x\times10^{-1} M. The value of xx is __________. (Nearest integer)
Not attempted
Your answer: —
Correct answer: 25
323
[JEE Main 2021, 25 July Shift 1, Q52] At 298 K, the enthalpy of fusion of a solid (X) is 2.8 kJ mol−1\mathrm{kJ\ mol^{-1}} and the enthalpy of vaporization of the liquid (X) is 98.2 kJ mol−1\mathrm{kJ\ mol^{-1}}. The enthalpy of sublimation of the substance (X) in kJ mol−1\mathrm{kJ\ mol^{-1}} is __________. (in nearest integer)
Not attempted
Your answer: —
Correct answer: 101
324
[JEE Main 2021, 25 July Shift 1, Q59] A home owner uses 4.00×103 m34.00\times10^{3}\ \mathrm{m^3} of methane (CH4\mathrm{CH_4}) gas, (assume CH4\mathrm{CH_4} is an ideal gas) in a year to heat his home. Under the pressure of 1.0 atm and 300 K, mass of gas used is x×105x\times10^{5} g. The value of xx is ___________. (Nearest integer) (Given R=0.083 L atm K−1 mol−1R = 0.083\ \mathrm{L\ atm\ K^{-1}\ mol^{-1}})
Not attempted
Your answer: —
Correct answer: 26
325
[JEE Main 2021, 25 July Shift 1, Q51] The number of sigma bonds in H3C−CH=CH−C≡C−H\mathrm{H_3C{-}CH{=}CH{-}C{\equiv}C{-}H} is ____________.
Not attempted
Your answer: —
Correct answer: 10
326
[JEE Main 2021, 25 July Shift 1, Q40] The ionic radii of K+\mathrm{K^+}, Na+\mathrm{Na^+}, Al3+\mathrm{Al^{3+}} and Mg2+\mathrm{Mg^{2+}} are in the order:
Not attempted
A
K+<Al3+<Mg2+<Na+\mathrm{K^+ < Al^{3+} < Mg^{2+} < Na^+}
B
Al3+<Mg2+<K+<Na+\mathrm{Al^{3+} < Mg^{2+} < K^+ < Na^+}
C
Al3+<Mg2+<Na+<K+\mathrm{Al^{3+} < Mg^{2+} < Na^+ < K^+}
D
Na+<K+<Mg2+<Al3+\mathrm{Na^+ < K^+ < Mg^{2+} < Al^{3+}}
327
[JEE Main 2021, 25 July Shift 1, Q58] A source of monochromatic radiation of wavelength 400 nm provides 1000 J of energy in 10 seconds. When this radiation falls on the surface of sodium, x×1020x\times10^{20} electrons are ejected per second. Assume that wavelength 400 nm is sufficient for ejection of electron from the surface of sodium metal. The value of xx is _______ (Nearest integer) (h=6.626×10−34h = 6.626\times10^{-34} Js)
Not attempted
Your answer: —
Correct answer: 2
328
[JEE Main 2021, 25 July Shift 1, Q53] Consider the complete combustion of butane, the amount of butane utilized to produce 72.0 g of water is __________ ×10−1\times 10^{-1} g. (in nearest integer)
Not attempted
Your answer: —
Correct answer: 464
329
[JEE Main 2021, 22 July Shift 2, Q40] Match List - I with List - II:\textbf{Match List - I with List - II:} List - IList - II(a) Chloroprene(i) structure (i) in figure(b) Neoprene(ii) structure (ii) in figure(c) Acrylonitrile(iii) structure (iii) in figure(d) Isoprene(iv) CH2=CH−CN\begin{array}{ll} \textbf{List - I} & \textbf{List - II} \\ \text{(a) Chloroprene} & \text{(i) structure (i) in figure} \\ \text{(b) Neoprene} & \text{(ii) structure (ii) in figure} \\ \text{(c) Acrylonitrile} & \text{(iii) structure (iii) in figure} \\ \text{(d) Isoprene} & \text{(iv) } \mathrm{CH_2{=}CH{-}CN} \end{array} Choose the correct answer from the options given below:
Not attempted
(i)(ii)Cl(iii)Cln
A
(a)-(iii), (b)-(i), (c)-(iv), (d)-(ii)\text{(a)-(iii), (b)-(i), (c)-(iv), (d)-(ii)}
B
(a)-(iii), (b)-(iv), (c)-(ii), (d)-(i)\text{(a)-(iii), (b)-(iv), (c)-(ii), (d)-(i)}
C
(a)-(ii), (b)-(i), (c)-(iv), (d)-(iii)\text{(a)-(ii), (b)-(i), (c)-(iv), (d)-(iii)}
D
(a)-(ii), (b)-(iii), (c)-(iv), (d)-(i)\text{(a)-(ii), (b)-(iii), (c)-(iv), (d)-(i)}
330
[JEE Main 2021, 22 July Shift 2, Q46] Thiamine and pyridoxine are also known respectively as:
Not attempted
A
Vitamin B1\mathrm{B_1} and Vitamin B6\mathrm{B_6}
B
Vitamin E\mathrm{E} and Vitamin B2\mathrm{B_2}
C
Vitamin B6\mathrm{B_6} and Vitamin B2\mathrm{B_2}
D
Vitamin B2\mathrm{B_2} and Vitamin E\mathrm{E}
331
[JEE Main 2021, 22 July Shift 2, Q43] Benzenediazonium chloride (C6H5N2+Cl−)(\mathrm{C_6H_5N_2^+Cl^-}) is converted to benzene on reaction with A\mathrm{A} and H2O\mathrm{H_2O} (C6H5N2+Cl−+A+H2O→C6H6\mathrm{C_6H_5N_2^+Cl^-} + \mathrm{A} + \mathrm{H_2O} \rightarrow \mathrm{C_6H_6}, the major product). Benzene on treatment with B\mathrm{B} in presence of anhydrous AlCl3\mathrm{AlCl_3} gives ethylbenzene, C6H5CH2CH3\mathrm{C_6H_5CH_2CH_3}, as the major product. In the chemical reactions given above A and B respectively are:
Not attempted
A
CH3CH2OH\mathrm{CH_3CH_2OH} and H3PO2\mathrm{H_3PO_2}
B
CH3CH2Cl\mathrm{CH_3CH_2Cl} and H3PO2\mathrm{H_3PO_2}
C
H3PO2\mathrm{H_3PO_2} and CH3CH2OH\mathrm{CH_3CH_2OH}
D
H3PO2\mathrm{H_3PO_2} and CH3CH2Cl\mathrm{CH_3CH_2Cl}
332
[JEE Main 2021, 22 July Shift 2, Q47] Which one of the following reactions does not occur?
Not attempted
A
Aniline + CH3Cl / AlCl3→+\ \mathrm{CH_3Cl}\ /\ \mathrm{AlCl_3} \rightarrow 4-methylaniline (Friedel-Crafts alkylation)
B
Aniline + HNO3 / H2SO4→+\ \mathrm{HNO_3}\ /\ \mathrm{H_2SO_4} \rightarrow 4-nitroaniline
C
Aniline + (CH3CO)2O→+\ (\mathrm{CH_3CO})_2\mathrm{O} \rightarrow acetanilide, C6H5NHCOCH3\mathrm{C_6H_5NHCOCH_3}
D
Aniline + H2SO4→+\ \mathrm{H_2SO_4} \rightarrow 4-aminobenzenesulphonic acid (sulphanilic acid)
333
[JEE Main 2021, 22 July Shift 2, Q31] Which one of the following compounds will provide a tertiary alcohol on reaction with excess of CH3MgBr\mathrm{CH_3MgBr} followed by hydrolysis?
Not attempted
A
Structure (A)\text{Structure (A)}
OO
B
Structure (B)\text{Structure (B)}
ONCCH
C
Structure (C)\text{Structure (C)}
OOCH3
D
Structure (D)\text{Structure (D)}
OCH3OH
334
[JEE Main 2021, 22 July Shift 2, Q38] An organic compound A (C6H6O)(\mathrm{C_6H_6O}) gives dark green colouration with ferric chloride. On treatment with CHCl3\mathrm{CHCl_3} and KOH\mathrm{KOH}, followed by acidification gives compound B. Compound B can also be obtained from compound C on reaction with pyridinium chlorochromate (PCC). Identify A, B and C.
Not attempted
A
A = phenol, B = 2-hydroxybenzyl alcohol, C = salicylaldehyde\text{A = phenol, B = 2-hydroxybenzyl alcohol, C = salicylaldehyde}
B
A = 2-hydroxybenzyl alcohol, B = salicylaldehyde, C = phenol\text{A = 2-hydroxybenzyl alcohol, B = salicylaldehyde, C = phenol}
C
A = salicylaldehyde, B = 2-hydroxybenzyl alcohol, C = phenol\text{A = salicylaldehyde, B = 2-hydroxybenzyl alcohol, C = phenol}
D
A = phenol, B = salicylaldehyde, C = 2-hydroxybenzyl alcohol\text{A = phenol, B = salicylaldehyde, C = 2-hydroxybenzyl alcohol}
335
[JEE Main 2021, 22 July Shift 2, Q51] The total number of unpaired electrons present in [Co(NH3)6]Cl2\mathrm{[Co(NH_3)_6]Cl_2} and [Co(NH3)6]Cl3\mathrm{[Co(NH_3)_6]Cl_3} is ____.
Not attempted
Your answer: —
Correct answer: 1
336
[JEE Main 2021, 22 July Shift 2, Q37] The set having ions which are coloured and paramagnetic both is:
Not attempted
A
Ni2+,Mn7+,Hg2+\mathrm{Ni^{2+}, Mn^{7+}, Hg^{2+}}
B
Cu+,Zn2+,Mn4+\mathrm{Cu^{+}, Zn^{2+}, Mn^{4+}}
C
Sc3+,V5+,Ti4+\mathrm{Sc^{3+}, V^{5+}, Ti^{4+}}
D
Cu2+,Cr3+,Sc+\mathrm{Cu^{2+}, Cr^{3+}, Sc^{+}}
337
[JEE Main 2021, 22 July Shift 2, Q42] Sulphide ion is soft base and its ores are common for metals. (a) Pb\mathrm{Pb} (b) Al\mathrm{Al} (c) Ag\mathrm{Ag} (d) Mg\mathrm{Mg} Choose the correct answer from the options given below:
Not attempted
A
(c) and (d) only
B
(a) and (c) only
C
(a) and (d) only
D
(a) and (b) only
338
[JEE Main 2021, 22 July Shift 2, Q32] When silver nitrate solution is added to potassium iodide solution then the sol produced is:
Not attempted
A
AgI/I−\mathrm{AgI/I^-}
B
AgNO3/NO3−\mathrm{AgNO_3/NO_3^-}
C
KI/NO3−\mathrm{KI/NO_3^-}
D
AgI/Ag+\mathrm{AgI/Ag^+}
339
[JEE Main 2021, 22 July Shift 2, Q52] N2O5(g)→2NO2(g)+12O2(g)\mathrm{N_2O_5(g) \rightarrow 2NO_2(g) + \tfrac{1}{2}O_2(g)}. In the above first order reaction the initial concentration of N2O5\mathrm{N_2O_5} is 2.40×10−2 mol L−12.40 \times 10^{-2}\ \mathrm{mol\ L^{-1}} at 318 K318\ \mathrm{K}. The concentration of N2O5\mathrm{N_2O_5} after 11 hour was 1.60×10−2 mol L−11.60 \times 10^{-2}\ \mathrm{mol\ L^{-1}}. The rate constant of the reaction at 318 K318\ \mathrm{K} is ____ ×10−3 min−1\times 10^{-3}\ \mathrm{min^{-1}}. (Nearest integer) [Given: log⁡3=0.477\log 3 = 0.477, log⁡5=0.699\log 5 = 0.699]
Not attempted
Your answer: —
Correct answer: 7
340
[JEE Main 2021, 22 July Shift 2, Q58] Assume a cell with the following reaction: Cu(s)+2Ag+(1×10−3 M)→Cu2+(0.250 M)+2Ag(s)\mathrm{Cu(s) + 2Ag^+(1\times10^{-3}\ M) \rightarrow Cu^{2+}(0.250\ M) + 2Ag(s)}, Ecell∘=2.97 VE^\circ_{cell} = 2.97\ \mathrm{V}. EcellE_{cell} for the above reaction is ____ V\mathrm{V}. (Nearest integer) [Given: log⁡2.5=0.3979\log 2.5 = 0.3979, T=298 KT = 298\ \mathrm{K}]
Not attempted
Your answer: —
Correct answer: 3
341
[JEE Main 2021, 22 July Shift 2, Q34] Which one of the following 0.06 M0.06\ \mathrm{M} aqueous solutions has lowest freezing point?
Not attempted
A
KI\mathrm{KI}
B
C6H12O6\mathrm{C_6H_{12}O_6}
C
K2SO4\mathrm{K_2SO_4}
D
Al2(SO4)3\mathrm{Al_2(SO_4)_3}
342
[JEE Main 2021, 22 July Shift 2, Q56] A copper complex crystallizing in a CCP lattice with a cell edge of 0.4518 nm0.4518\ \mathrm{nm} has been revealed by employing X-ray diffraction studies. The density of a copper complex is found to be 7.62 g cm−37.62\ \mathrm{g\ cm^{-3}}. The molar mass of the copper complex is ____ g mol−1\mathrm{g\ mol^{-1}}. (Nearest integer) [Given: NA=6.022×1023 mol−1N_A = 6.022 \times 10^{23}\ \mathrm{mol^{-1}}]
Not attempted
Your answer: —
Correct answer: 106
343
[JEE Main 2021, 22 July Shift 2, Q49] The water having more dissolved O2\mathrm{O_2} is:
Not attempted
A
Water at 80∘C80^\circ\mathrm{C}
B
boiling water
C
polluted water
D
water at 4∘C4^\circ\mathrm{C}
344
[JEE Main 2021, 22 July Shift 2, Q57] The number of acyclic structural isomers (including geometrical isomers) for pentene is ____.
Not attempted
Your answer: —
Correct answer: 6
345
[JEE Main 2021, 22 July Shift 2, Q36] Which one of the following compounds does not exhibit resonance?
Not attempted
A
CH3CH2CH2CONH2\mathrm{CH_3CH_2CH_2CONH_2}
B
CH3CH2CH=CHCH2NH2\mathrm{CH_3CH_2CH{=}CHCH_2NH_2}
C
CH3CH2OCH=CH2\mathrm{CH_3CH_2OCH{=}CH_2}
D
C6H5CH2OH\mathrm{C_6H_5CH_2OH} (benzyl alcohol)
346
[JEE Main 2021, 22 July Shift 2, Q41] Which one of the following molecules does not show stereo isomerism?
Not attempted
A
3 - Ethylhex - 3 - ene
B
3 - Methylhex - 1 - ene
C
3,4 - Dimethylhex - 3 - ene
D
4 - Methylhex - 1 - ene
347
[JEE Main 2021, 22 July Shift 2, Q50] Which purification technique is used for high boiling organic liquid compound (decomposes near its boiling point)?
Not attempted
A
Fractional distillation
B
Steam distillation
C
Simple distillation
D
Reduced pressure distillation
348
[JEE Main 2021, 22 July Shift 2, Q39] Given below are the statements about diborane. (a) Diborane is prepared by the oxidation of NaBH4\mathrm{NaBH_4} with I2\mathrm{I_2}. (b) Each boron atom is in sp2sp^2 hybridized state. (c) Diborane has one bridged 3 centre - 2 - electron bond. (d) Diborane is a planar molecule. The option with correct statement(s) is:
Not attempted
A
(a) only
B
(c) only
C
(a) and (b) only
D
(c) and (d) only
349
[JEE Main 2021, 22 July Shift 2, Q45] Which one of the following group - 15 hydride is the strongest reducing agent?
Not attempted
A
AsH3\mathrm{AsH_3}
B
SbH3\mathrm{SbH_3}
C
BiH3\mathrm{BiH_3}
D
PH3\mathrm{PH_3}
350
[JEE Main 2021, 22 July Shift 2, Q44] Match List - I with List - II:\textbf{Match List - I with List - II:} List - I (Elements)List - II (Properties)(a) Ba(i) Organic solvent soluble compounds(b) Ca(ii) Outer electronic configuration 6s2(c) Li(iii) Oxalate insoluble in water(d) Na(iv) Formation of very strong monoacidic base\begin{array}{ll} \textbf{List - I (Elements)} & \textbf{List - II (Properties)} \\ \text{(a) Ba} & \text{(i) Organic solvent soluble compounds} \\ \text{(b) Ca} & \text{(ii) Outer electronic configuration } 6s^2 \\ \text{(c) Li} & \text{(iii) Oxalate insoluble in water} \\ \text{(d) Na} & \text{(iv) Formation of very strong monoacidic base} \end{array} Choose the correct answer from the options given below:
Not attempted
A
(a)-(ii), (b)-(iii), (c)-(i) and (d)-(iv)\text{(a)-(ii), (b)-(iii), (c)-(i) and (d)-(iv)}
B
(a)-(iv), (b)-(i), (c)-(ii) and (d)-(iii)\text{(a)-(iv), (b)-(i), (c)-(ii) and (d)-(iii)}
C
(a)-(i), (b)-(iv), (c)-(ii) and (d)-(iii)\text{(a)-(i), (b)-(iv), (c)-(ii) and (d)-(iii)}
D
(a)-(iii), (b)-(ii), (c)-(iv) and (d)-(i)\text{(a)-(iii), (b)-(ii), (c)-(iv) and (d)-(i)}
351
[JEE Main 2021, 22 July Shift 2, Q55] Value of KpK_p for the equilibrium reaction N2O4(g)⇌2NO2(g)\mathrm{N_2O_4(g) \rightleftharpoons 2NO_2(g)} at 288 K288\ \mathrm{K} is 47.947.9. The KcK_c for this reaction at same temperature is ____. (Nearest integer) (R=0.083 L bar K−1 mol−1R = 0.083\ \mathrm{L\ bar\ K^{-1}\ mol^{-1}})
Not attempted
Your answer: —
Correct answer: 2
352
[JEE Main 2021, 22 July Shift 2, Q54] If the standard molar enthalpy change for combustion of graphite powder is −2.48×102 kJ mol−1-2.48 \times 10^{2}\ \mathrm{kJ\ mol^{-1}}, the amount of heat generated on combustion of 1 g1\ \mathrm{g} of graphite powder is ____ kJ\mathrm{kJ}. (Nearest integer)
Not attempted
Your answer: —
Correct answer: 21
353
[JEE Main 2021, 22 July Shift 2, Q35] Match List - I with List - II:\textbf{Match List - I with List - II:} List - I (Species)List - II (Hybrid Orbitals)(a) SF4(i) sp3d2(b) IF5(ii) d2sp3(c) NO2+(iii) sp3d(d) NH4+(iv) sp3(v) sp\begin{array}{ll} \textbf{List - I (Species)} & \textbf{List - II (Hybrid Orbitals)} \\ \text{(a) } \mathrm{SF_4} & \text{(i) } sp^3d^2 \\ \text{(b) } \mathrm{IF_5} & \text{(ii) } d^2sp^3 \\ \text{(c) } \mathrm{NO_2^+} & \text{(iii) } sp^3d \\ \text{(d) } \mathrm{NH_4^+} & \text{(iv) } sp^3 \\ & \text{(v) } sp \end{array} Choose the correct answer from the options given below:
Not attempted
A
(a)-(iii), (b)-(i), (c)-(v) and (d)-(iv)\text{(a)-(iii), (b)-(i), (c)-(v) and (d)-(iv)}
B
(a)-(ii), (b)-(i), (c)-(iv) and (d)-(v)\text{(a)-(ii), (b)-(i), (c)-(iv) and (d)-(v)}
C
(a)-(i), (b)-(ii), (c)-(v) and (d)-(iii)\text{(a)-(i), (b)-(ii), (c)-(v) and (d)-(iii)}
D
(a)-(iv), (b)-(iii), (c)-(ii) and (d)-(v)\text{(a)-(iv), (b)-(iii), (c)-(ii) and (d)-(v)}
354
[JEE Main 2021, 22 July Shift 2, Q48] Which one of the following statements for D.I. Mendeleeff, is incorrect?
Not attempted
A
At the time, he proposed periodic table of elements structure of atom was known.
B
Element with atomic number 101 is named after him.
C
He invented accurate barometer.
D
He authored the textbook - Principles of Chemistry.
355
[JEE Main 2021, 22 July Shift 2, Q33] Isotope(s) of hydrogen which emits low energy β−\beta^- particles with t1/2t_{1/2} value >12> 12 years is / are:
Not attempted
A
Protium
B
Tritium
C
Deuterium
D
Deuterium and Tritium
356
[JEE Main 2021, 22 July Shift 2, Q53] Number of electrons that Vanadium (Z=23)(Z = 23) has in p-orbitals is equal to ____.
Not attempted
Your answer: —
Correct answer: 12
357
[JEE Main 2021, 22 July Shift 2, Q59] Methylation of 10 g10\ \mathrm{g} of benzene gives 9.2 g9.2\ \mathrm{g} of toluene. Calculate the percentage yield of toluene ____. (Nearest integer)
Not attempted
Your answer: —
Correct answer: 78
358
[JEE Main 2021, 22 July Shift 2, Q60] If the concentration of glucose (C6H12O6)(\mathrm{C_6H_{12}O_6}) in blood is 0.72 g L−10.72\ \mathrm{g\ L^{-1}}, the molarity of glucose in blood is ____ ×10−3 M\times 10^{-3}\ \mathrm{M}. (Nearest integer) (Given: Atomic mass of C = 12, H = 1, O = 16 u)
Not attempted
Your answer: —
Correct answer: 4
359
[JEE Main 2021, 20 July Shift 2, Q34] Bakelite is a cross- linked polymer of formaldehyde and :
Not attempted
A
PHBV
B
Buna - S
C
Novolac
D
Dacron
360
[JEE Main 2021, 20 July Shift 2, Q39] Which one of the following statements is not true about enzymes ?
Not attempted
A
The action of enzymes is temperature and pH specific.
B
Enzymes are non-specific for a reaction and substrate.
C
Enzymes work as catalysts by lowering the activation energy of a biochemical reaction.
D
Almost all enzymes are proteins.
361
[JEE Main 2021, 20 July Shift 2, Q33] The reactions of 3-bromobenzamide with KOBr\mathrm{KOBr} (giving A) and with LiAlH4\mathrm{LiAlH_4} followed by H3O+\mathrm{H_3O^+} (giving B) are shown in the figure. In the above reactions, product A and product B respectively are:
Not attempted
BrONH2KOBrA(major product)BrONH2LiAlH4H3O+B(major product)
A
Structures (A)\text{Structures (A)}
NH2,BrNH2
B
Structures (B)\text{Structures (B)}
BrNH2,BrNH2
C
Structures (C)\text{Structures (C)}
BrNH2,NH2
D
Structures (D)\text{Structures (D)}
NH2,NH2
362
[JEE Main 2021, 20 July Shift 2, Q40] In the reaction shown in the figure, p-aminobenzenesulphonic acid (sulphanilic acid) is first treated with NaNO2\mathrm{NaNO_2}, HCl\mathrm{HCl} at 273273-278278 K to give A, and A reacts with N,N-dimethylaniline at 273273 K to give B. Consider the above reaction, compound B is :
Not attempted
H2NSO3HNaNO2, HCl273 - 278 KA(major product)273 KNCH3CH3B(major product)
A
Structure (A)\text{Structure (A)}
HO3SNNNCH3CH3
B
Structure (B)\text{Structure (B)}
NNNCH3CH3
C
Structure (C)\text{Structure (C)}
HO3SNCH3CH3
D
Structure (D)\text{Structure (D)}
HO3SNNNCH3CH3
363
[JEE Main 2021, 20 July Shift 2, Q36] Consider the following four acid derivatives (R is the same alkyl group in each): (a) R−CO−Cl\mathrm{R{-}CO{-}Cl} (acid chloride) (b) R−CO−O−CO−R\mathrm{R{-}CO{-}O{-}CO{-}R} (acid anhydride) (c) R−CO−OR\mathrm{R{-}CO{-}OR} (ester) (d) R−CO−NH2\mathrm{R{-}CO{-}NH_2} (amide) The correct order of their reactivity towards hydrolysis at room temperature is:
Not attempted
A
(d) > (b) > (a) > (c)
B
(d) > (a) > (b) > (c)
C
(a) > (c) > (b) > (d)
D
(a) > (b) > (c) > (d)
364
[JEE Main 2021, 20 July Shift 2, Q49] The major product (P) in the following reaction is :
Not attempted
OCHOO(i) KOH alc.(ii) H+, ΔP(major product)
A
Structure (A)\text{Structure (A)}
OOHC
B
Structure (B)\text{Structure (B)}
CHOO
C
Structure (C)\text{Structure (C)}
OO
D
Structure (D)\text{Structure (D)}
OO
365
[JEE Main 2021, 20 July Shift 2, Q31] The reaction scheme shown in the figure converts the given allylbenzene derivative to P. Major product P of the above reaction is:
Not attempted
Br(i) (C6H5CO)2O2, HBr(ii) CoF2P(major product)
A
Structure (A)\text{Structure (A)}
BrF
B
Structure (B)\text{Structure (B)}
BrF
C
Structure (C)\text{Structure (C)}
FF
D
Structure (D)\text{Structure (D)}
BrF
366
[JEE Main 2021, 20 July Shift 2, Q37] Spin only magnetic moment of an octahedral complex of Fe2+\mathrm{Fe^{2+}} in the presence of a strong field ligand in BM is :
Not attempted
A
2.822.82
B
3.463.46
C
00
D
4.894.89
367
[JEE Main 2021, 20 July Shift 2, Q43] Which one of the following species doesn't have a magnetic moment of 1.731.73 BM, (spin only value)?
Not attempted
A
CuI\mathrm{CuI}
B
[Cu(NH3)4]Cl2\mathrm{[Cu(NH_3)_4]Cl_2}
C
O2−\mathrm{O_2^-}
D
O2+\mathrm{O_2^+}
368
[JEE Main 2021, 20 July Shift 2, Q56] An aqueous solution of NiCl2\mathrm{NiCl_2} was heated with excess sodium cyanide in presence of strong oxidizing agent to form [Ni(CN)6]2−\mathrm{[Ni(CN)_6]^{2-}}. The total change in number of unpaired electrons on metal centre is ________.
Not attempted
Your answer: —
Correct answer: 2
369
[JEE Main 2021, 20 July Shift 2, Q38] Cu2+\mathrm{Cu^{2+}} salt reacts with potassium iodide to give :
Not attempted
A
Cu2I3\mathrm{Cu_2I_3}
B
Cu2I2\mathrm{Cu_2I_2}
C
Cu(I3)2\mathrm{Cu(I_3)_2}
D
CuI\mathrm{CuI}
370
[JEE Main 2021, 20 July Shift 2, Q35] Consider two chemical reactions (A) and (B) that take place during metallurgical process: (a) ZnCO3(s)→ΔZnO(s)+CO2(g)\mathrm{ZnCO_3(s)} \xrightarrow{\Delta} \mathrm{ZnO(s)} + \mathrm{CO_2(g)} (b) 2ZnS(s)+3O2(g)→Δ2ZnO(s)+2SO2(g)\mathrm{2ZnS(s)} + 3\mathrm{O_2(g)} \xrightarrow{\Delta} 2\mathrm{ZnO(s)} + 2\mathrm{SO_2(g)} The correct option of names given to them respectively is :
Not attempted
A
(a) is calcination and (b) is roasting
B
Both (a) and (b) are producing same product so both are calcination
C
Both (a) and (b) are producing same product so both are roasting
D
(a) is roasting and (b) is calcination
371
[JEE Main 2021, 20 July Shift 2, Q55] 100 mL100\ \mathrm{mL} of 0.0018%0.0018\% (w/v) solution of Cl−\mathrm{Cl^-} ion was the minimum concentration of Cl−\mathrm{Cl^-} required to precipitate a negative sol in one h. The coagulating value of Cl−\mathrm{Cl^-} ion is _______. (Nearest integer)
Not attempted
Your answer: —
Correct answer: 1
372
[JEE Main 2021, 20 July Shift 2, Q59] PCl5(g)→PCl3(g)+Cl2(g)\mathrm{PCl_5(g)} \rightarrow \mathrm{PCl_3(g)} + \mathrm{Cl_2(g)} In the above first order reaction, the concentration of PCl5\mathrm{PCl_5} reduces from initial concentration 50 mol L−150\ \mathrm{mol\ L^{-1}} to 10 mol L−110\ \mathrm{mol\ L^{-1}} in 120120 minutes at 300 K300\ \mathrm{K}. The rate constant for the reaction at 300 K300\ \mathrm{K} is x×10−2 min−1x \times 10^{-2}\ \mathrm{min^{-1}}. The value of x is ________. Given log⁡5=0.6989\log 5 = 0.6989
Not attempted
Your answer: —
Correct answer: 1
373
[JEE Main 2021, 20 July Shift 2, Q60] Potassium chlorate is prepared by electrolysis of KCl\mathrm{KCl} in basic solution as shown by following equation. 6 OH−+Cl−→ClO3−+3 H2O+6 e−\mathrm{6\,OH^- + Cl^- \rightarrow ClO_3^- + 3\,H_2O + 6\,e^-} A current of x Ax\ \mathrm{A} has to be passed for 10 h10\ \mathrm{h} to produce 10.0 g10.0\ \mathrm{g} of potassium chlorate. The value of xx is ________. (Nearest Integer) (Molar mass of KClO3=122.6 g mol−1\mathrm{KClO_3} = 122.6\ \mathrm{g\ mol^{-1}}, F=96500 CF = 96500\ \mathrm{C})
Not attempted
Your answer: —
Correct answer: 1
374
[JEE Main 2021, 20 July Shift 2, Q58] The vapour pressures of A and B at 25∘C25^\circ\mathrm{C} are 90 mm Hg90\ \mathrm{mm\ Hg} and 15 mm Hg15\ \mathrm{mm\ Hg} respectively. If A and B are mixed such that the mole fraction of A in the mixture is 0.60.6, then the mole fraction of B in the vapour phase is x×10−1x \times 10^{-1}. The value x is _______. (Nearest Integer)
Not attempted
Your answer: —
Correct answer: 1
375
[JEE Main 2021, 20 July Shift 2, Q57] Diamond has a three dimensional structure of C atoms formed by covalent bonds. The structure of diamond has face centred cubic lattice where 50%50\% of the tetrahedral voids are also occupied by carbon atoms. The number of carbon atoms present per unit cell of diamond is __________.
Not attempted
Your answer: —
Correct answer: 8
376
[JEE Main 2021, 20 July Shift 2, Q41] Which one of the following gases is reported to retard photosynthesis ?
Not attempted
A
CO2\mathrm{CO_2}
B
CFCs
C
CO\mathrm{CO}
D
NO2\mathrm{NO_2}
377
[JEE Main 2021, 20 July Shift 2, Q42] Benzene on nitration gives nitrobenzene in presence of HNO3\mathrm{HNO_3} and H2SO4\mathrm{H_2SO_4} mixture, where:
Not attempted
A
both H2SO4\mathrm{H_2SO_4} and HNO3\mathrm{HNO_3} act as a bases
B
both H2SO4\mathrm{H_2SO_4} and HNO3\mathrm{HNO_3} act as an acids
C
HNO3\mathrm{HNO_3} acts as a base and H2SO4\mathrm{H_2SO_4} acts as an acid
D
HNO3\mathrm{HNO_3} acts as an acid and H2SO4\mathrm{H_2SO_4} acts as a base
378
[JEE Main 2021, 20 July Shift 2, Q46] Metallic sodium does not react normally with :
Not attempted
A
gaseous ammonia
B
tert - butyl alcohol
C
But - 2 - yne
D
Ethyne
379
[JEE Main 2021, 20 July Shift 2, Q44] Which one of the following pairs of isomers is an example of metamerism?
Not attempted
A
CH3−CO−C6H5\mathrm{CH_3{-}CO{-}C_6H_5} (acetophenone) and C6H5−CH2CH2−CHO\mathrm{C_6H_5{-}CH_2CH_2{-}CHO}
B
CH3CH2CH2CH2CH3\mathrm{CH_3CH_2CH_2CH_2CH_3} (pentane) and C(CH3)4\mathrm{C(CH_3)_4} (neopentane)
C
heptan-3-one (CH3CH2CH2CH2−CO−CH2CH3\mathrm{CH_3CH_2CH_2CH_2{-}CO{-}CH_2CH_3}) and heptan-4-one (CH3CH2CH2−CO−CH2CH2CH3\mathrm{CH_3CH_2CH_2{-}CO{-}CH_2CH_2CH_3})
D
C6H5−CH2CH2−OH\mathrm{C_6H_5{-}CH_2CH_2{-}OH} and C6H5−CH(OH)−CH3\mathrm{C_6H_5{-}CH(OH){-}CH_3}
380
[JEE Main 2021, 20 July Shift 2, Q47] In Carius method, halogen containing organic compound is heated with fuming nitric acid in the presence of :
Not attempted
A
AgNO3\mathrm{AgNO_3}
B
HNO3\mathrm{HNO_3}
C
BaSO4\mathrm{BaSO_4}
D
CuSO4\mathrm{CuSO_4}
381
[JEE Main 2021, 20 July Shift 2, Q52] When 0.15 g0.15\ \mathrm{g} of an organic compound was analyzed using Carius method for estimation of bromine, 0.2397 g0.2397\ \mathrm{g} of AgBr\mathrm{AgBr} was obtained. The percentage of bromine in the organic compound is ________. (Nearest Integer) (Atomic mass: Ag=108\mathrm{Ag} = 108, Br=80\mathrm{Br} = 80)
Not attempted
Your answer: —
Correct answer: 68
382
[JEE Main 2021, 20 July Shift 2, Q48] The single largest industrial application of dihydrogen is :
Not attempted
A
Rocket fuel in space research
B
In the synthesis of nitric acid
C
In the synthesis of ammonia
D
Manufacture of metal hydrides
383
[JEE Main 2021, 20 July Shift 2, Q50] A solution is 0.1 M0.1\ \mathrm{M} in Cl−\mathrm{Cl^-} and 0.001 M0.001\ \mathrm{M} in CrO42−\mathrm{CrO_4^{2-}}. Solid AgNO3\mathrm{AgNO_3} is gradually added to it. Assuming that the addition does not change in volume and Ksp(AgCl)=1.7×10−10 M2K_{sp}(\mathrm{AgCl}) = 1.7\times10^{-10}\ \mathrm{M^2} and Ksp(Ag2CrO4)=1.9×10−12 M3K_{sp}(\mathrm{Ag_2CrO_4}) = 1.9\times10^{-12}\ \mathrm{M^3}. Select correct statement from the following :
Not attempted
A
Ag2CrO4\mathrm{Ag_2CrO_4} precipitates first because the amount of Ag+\mathrm{Ag^+} needed is low.
B
Ag2CrO4\mathrm{Ag_2CrO_4} precipitates first as its KspK_{sp} is low.
C
AgCl\mathrm{AgCl} will precipitate first as the amount of Ag+\mathrm{Ag^+} needed to precipitate is low.
D
AgCl\mathrm{AgCl} precipitates first because its KspK_{sp} is high.
384
[JEE Main 2021, 20 July Shift 2, Q53] For a given chemical reaction A→B\mathrm{A \rightarrow B} at 300 K300\ \mathrm{K} the free energy change is −49.4 kJ mol−1-49.4\ \mathrm{kJ\ mol^{-1}} and the enthalpy of reaction is 51.4 kJ mol−151.4\ \mathrm{kJ\ mol^{-1}}. The entropy change of the reaction is ________ J K−1 mol−1\mathrm{J\ K^{-1}\ mol^{-1}}.
Not attempted
Your answer: —
Correct answer: 336
385
[JEE Main 2021, 20 July Shift 2, Q45] The hybridisations of the atomic orbitals of nitrogen in NO2−\mathrm{NO_2^-}, NO2+\mathrm{NO_2^+} and NH4+\mathrm{NH_4^+} respectively are :
Not attempted
A
sp3,spsp^3, sp and sp2sp^2
B
sp,sp2sp, sp^2 and sp3sp^3
C
sp2,spsp^2, sp and sp3sp^3
D
sp3,sp2sp^3, sp^2 and spsp
386
[JEE Main 2021, 20 July Shift 2, Q32] Outermost electronic configuration of a group 13 element, E, is 4s2,4p14s^2, 4p^1. The electronic configuration of an element of p-block period-five placed diagonally to element, E is:
Not attempted
A
[Kr] 4d105s25p2[\mathrm{Kr}]\,4d^{10}5s^25p^2
B
[Kr] 3d104s24p2[\mathrm{Kr}]\,3d^{10}4s^24p^2
C
[Xe] 5d106s26p2[\mathrm{Xe}]\,5d^{10}6s^26p^2
D
[Ar] 3d104s24p2[\mathrm{Ar}]\,3d^{10}4s^24p^2
387
[JEE Main 2021, 20 July Shift 2, Q54] The wavelength of electrons accelerated from rest through a potential difference of 40 kV40\ \mathrm{kV} is x×10−12 mx \times 10^{-12}\ \mathrm{m}. The value of xx is ________. (Nearest Integer) Given : Mass of electron =9.1×10−31 kg= 9.1\times10^{-31}\ \mathrm{kg} Charge on an electron =1.6×10−19 C= 1.6\times10^{-19}\ \mathrm{C} Planck's constant =6.63×10−34 Js= 6.63\times10^{-34}\ \mathrm{Js}
Not attempted
Your answer: —
Correct answer: 6
388
[JEE Main 2021, 20 July Shift 2, Q51] 4 g4\ \mathrm{g} equimolar mixture of NaOH\mathrm{NaOH} and Na2CO3\mathrm{Na_2CO_3} contains x gx\ \mathrm{g} of NaOH\mathrm{NaOH} and y gy\ \mathrm{g} of Na2CO3\mathrm{Na_2CO_3}. The value of xx is __________ g. (Nearest Integer)
Not attempted
Your answer: —
Correct answer: 1
389
[JEE Main 2021, 20 July Shift 1, Q43] Orlon fibres are made up of:
Not attempted
A
Polyamide
B
Polyacrylonitrile
C
Cellulose
D
Polyesters
390
[JEE Main 2021, 20 July Shift 1, Q37] Identify the incorrect statement from the following:
Not attempted
A
β\beta-Glycosidic linkage makes cellulose polymer
B
Amylose is a branched chain polymer of glucose
C
Starch is a polymer of α\alpha- D glucose
D
Glycogen is called as animal starch
391
[JEE Main 2021, 20 July Shift 1, Q49] The correct structure of Rhumann's Purple, the compound formed in the reaction of ninhydrin with proteins is:
Not attempted
A
Structure (A)\text{Structure (A)}
NOOOO
B
Structure (B)\text{Structure (B)}
NOOOO
C
Structure (C)\text{Structure (C)}
NOOOO
D
Structure (D)\text{Structure (D)}
NNNOOOO
392
[JEE Main 2021, 20 July Shift 1, Q32] Compound A is converted to B on reaction with CHCl3\mathrm{CHCl_3} and KOH\mathrm{KOH}. The compound B is toxic and can be decomposed by C. A, B and C respectively are:
Not attempted
A
Primary amine, nitrile compound, conc. HCl\mathrm{HCl}
B
Primary amine, isonitrile compound, conc. HCl\mathrm{HCl}
C
Secondary amine, isonitrile compound, conc. NaOH\mathrm{NaOH}
D
Secondary amine, nitrile compound, conc. NaOH\mathrm{NaOH}
393
[JEE Main 2021, 20 July Shift 1, Q47] Four compounds (I), (II), (III) and (IV) are shown in the figure. Which among the above compound/s does / do not form silver mirror when treated with Tollen's reagent?
Not attempted
CHO(I)OH(II)OH(III)OOH(IV)
A
Only (IV)
B
(III) and (IV) only
C
Only (II)
D
(I), (III) and (IV) only
394
[JEE Main 2021, 20 July Shift 1, Q53] To synthesise 1.01.0 mole of 2-methylpropan-2-ol from Ethylethanoate _________ equivalents of CH3MgBr\mathrm{CH_3MgBr} reagent will be required. (Integer value)
Not attempted
Your answer: —
Correct answer: 2
395
[JEE Main 2021, 20 July Shift 1, Q58] The number of nitrogen atoms in a semicarbazone molecule of acetone is__________.
Not attempted
Your answer: —
Correct answer: 3
396
[JEE Main 2021, 20 July Shift 1, Q42] In the given reaction 3-Bromo-2,2-dimethyl butane → C2H5OH \xrightarrow{\ \mathrm{C_2H_5OH}\ } ′A′'A' (Major Product). Product A is:
Not attempted
A
2-Ethoxy-2,3-dimethyl butane
B
2-Hydroxy-3,3-dimethyl butane.
C
2-Ethoxy-3,3-dimethyl butane
D
1-Ethoxy-3,3-dimethyl butane.
397
[JEE Main 2021, 20 July Shift 1, Q41] According to the valence bond theory the hybridization of central metal atom is dsp2dsp^2 for which one of the following compounds?
Not attempted
A
K2[Ni(CN)4]\mathrm{K_2[Ni(CN)_4]}
B
NiCl2⋅6H2O\mathrm{NiCl_2{\cdot}6H_2O}
C
Na2[NiCl4]\mathrm{Na_2[NiCl_4]}
D
[Ni(CO)4]\mathrm{[Ni(CO)_4]}
398
[JEE Main 2021, 20 July Shift 1, Q50] The correct order of intensity of colors of the compounds is:
Not attempted
A
[NiCl4]2−>[Ni(H2O)6]2+>[Ni(CN)4]2−\mathrm{[NiCl_4]^{2-} > [Ni(H_2O)_6]^{2+} > [Ni(CN)_4]^{2-}}
B
[NiCl4]2−>[Ni(CN)4]2−>[Ni(H2O)6]2+\mathrm{[NiCl_4]^{2-} > [Ni(CN)_4]^{2-} > [Ni(H_2O)_6]^{2+}}
C
[Ni(H2O)6]2+>[NiCl4]2−>[Ni(CN)4]2−\mathrm{[Ni(H_2O)_6]^{2+} > [NiCl_4]^{2-} > [Ni(CN)_4]^{2-}}
D
[Ni(CN)4]2−>[NiCl4]2−>[Ni(H2O)6]2+\mathrm{[Ni(CN)_4]^{2-} > [NiCl_4]^{2-} > [Ni(H_2O)_6]^{2+}}
399
[JEE Main 2021, 20 July Shift 1, Q54] The spin only magnetic moment value for the complex [Co(CN)6]4−\mathrm{[Co(CN)_6]^{4-}} is______ BM. [At. No. of Co =27= 27]
Not attempted
Your answer: —
Correct answer: 1.73
400
[JEE Main 2021, 20 July Shift 1, Q46] An inorganic compound 'X' on treatment with concentrated H2SO4\mathrm{H_2SO_4} produces brown fumes and gives dark brown ring with FeSO4\mathrm{FeSO_4} in presence of concentrated H2SO4\mathrm{H_2SO_4}. Also compound 'X' gives precipitate 'Y', when its solution in dilute HCl\mathrm{HCl} is treated with H2S\mathrm{H_2S} gas. The precipitate 'Y' on treatment with concentrated HNO3\mathrm{HNO_3} followed by excess of NH4OH\mathrm{NH_4OH} further gives deep blue coloured solution, Compound 'X' is:
Not attempted
A
Cu(NO3)2\mathrm{Cu(NO_3)_2}
B
Pb(NO3)2\mathrm{Pb(NO_3)_2}
C
Co(NO3)2\mathrm{Co(NO_3)_2}
D
Pb(NO2)2\mathrm{Pb(NO_2)_2}
401
[JEE Main 2021, 20 July Shift 1, Q38] The metal that can be purified economically by fractional distillation method is:
Not attempted
A
Ni\mathrm{Ni}
B
Cu\mathrm{Cu}
C
Fe\mathrm{Fe}
D
Zn\mathrm{Zn}
402
[JEE Main 2021, 20 July Shift 1, Q40] The conditions given below are in the context of observing Tyndall effect in colloidal solutions: (a) The diameter of the colloidal particles is comparable to the wavelength of light used. (b) The diameter of the colloidal particles in much smaller than the wavelength of light used. (c) The diameter of the colloidal particles is much larger than the wavelength of light used. (d) The refractive indices of the dispersed phase and the dispersion medium are comparable. (e) The dispersed phase has a very different refractive index from the dispersion medium. Choose the most appropriate conditions from the options given below.
Not attempted
A
(a) and (d) only
B
(a) and (e) only
C
(c) and (d) only
D
(b) and (e) only
403
[JEE Main 2021, 20 July Shift 1, Q59] The inactivation rate of a viral preparation in proportional to the amount of virus. In the first minute after preparation, 10%10\% of the virus is inactivated. The rate constant for viral inactivation is ___________ ×10−3 min−1\times 10^{-3}\ \mathrm{min^{-1}}. (Nearest integer) [Use: ln⁡10=2.303\ln 10 = 2.303; log⁡103=0.477\log_{10} 3 = 0.477; property of logarithm: log⁡xy=ylog⁡x\log x^y = y \log x]
Not attempted
Your answer: —
Correct answer: 106
404
[JEE Main 2021, 20 July Shift 1, Q55] At 20∘C20^\circ\mathrm{C}, the vapour pressure of benzene is 7070 torr and that of methyl benzene is 2020 torr. The mole fraction of benzene in the vapour phase at 20∘C20^\circ\mathrm{C} above an equimolar mixture of benzene and methyl benzene is ____________ ×10−2\times 10^{-2}. (Nearest integer)
Not attempted
Your answer: —
Correct answer: 78
405
[JEE Main 2021, 20 July Shift 1, Q48] Given below are two statements. One is labelled as Assertion A\textbf{Assertion A} and the other is labelled as Reason R\textbf{Reason R}. Assertion A\textbf{Assertion A}: Sharp glass edge becomes smooth on heating it upto its melting point. Reason R\textbf{Reason R}: The viscosity of glass decreases on melting. Choose the most appropriate answer from the options given below.
Not attempted
A
A is false but R is true.
B
Both A and R are true but R is NOT the correct explanation of A.
C
A is true but R is false
D
Both A and R are true and R is the correct explanation of A.
406
[JEE Main 2021, 20 July Shift 1, Q36] Green chemistry in day- to day life is in the use of:
Not attempted
A
Chlorine for bleaching of paper
B
Large amount of water alone for washing clothes
C
Liquified CO2\mathrm{CO_2} for dry cleaning of clothes
D
Tetrachloroethene for laundry
407
[JEE Main 2021, 20 July Shift 1, Q45] Cyclohexene is treated with KMnO4\mathrm{KMnO_4} under two sets of conditions, as shown in the figure: (i) KMnO4\mathrm{KMnO_4}, H2SO4\mathrm{H_2SO_4}, Δ\Delta giving major product ′A′'A', and (ii) KMnO4\mathrm{KMnO_4}, H2O\mathrm{H_2O}, 273 K273\ \mathrm{K} giving major product ′B′'B'. For above chemical reactions, identify the correct statement from the following
Not attempted
KMnO4H2SO4, Δ‘A’(major product)KMnO4H2O, 273 K‘B’(major product)
A
Both compound 'A' and compound 'B' are dicarboxylic acids.
B
Compound 'A' is dicarboxylic acid and compound 'B' is diol.
C
Compound 'A' is diol and compound 'B' is dicarboxylic acid.
D
Both compound 'A' and compound 'B' are diols.
408
[JEE Main 2021, 20 July Shift 1, Q34] Four carbocations (A), (B), (C) and (D) are shown in the figure. Among the given species the Resonance stabilized carbocations are:
Not attempted
CH2(A)HHCH2(B)CH2(C)OCH(D)
A
(A), (B) and (C) only
B
(C) and (D) only
C
(A), (B) and (D) only
D
(A) and (B) only
409
[JEE Main 2021, 20 July Shift 1, Q31] Chemical nature of the nitrogen oxide compound obtained from a reaction of concentrated nitric acid and P4O10\mathrm{P_4O_{10}} (in 4:14:1 ratio) is:
Not attempted
A
basic
B
neutral
C
amphoteric
D
acidic
410
[JEE Main 2021, 20 July Shift 1, Q39] The set in which compounds have different nature is:
Not attempted
A
B(OH)3\mathrm{B(OH)_3} and Al(OH)3\mathrm{Al(OH)_3}
B
B(OH)3\mathrm{B(OH)_3} and H3PO3\mathrm{H_3PO_3}
C
NaOH\mathrm{NaOH} and Ca(OH)2\mathrm{Ca(OH)_2}
D
Be(OH)2\mathrm{Be(OH)_2} and Al(OH)3\mathrm{Al(OH)_3}
411
[JEE Main 2021, 20 July Shift 1, Q35] A s-block element (M) reacts with oxygen to form an oxide of the formula MO2\mathrm{MO_2}. The oxide is pale yellow in colour and paramagnetic. The element (M) is:
Not attempted
A
Na\mathrm{Na}
B
K\mathrm{K}
C
Mg\mathrm{Mg}
D
Ca\mathrm{Ca}
412
[JEE Main 2021, 20 July Shift 1, Q33] Given below are two statements : One is labelled as Assertion A\textbf{Assertion A} and the other is labelled as Reason R\textbf{Reason R}. Assertion A\textbf{Assertion A}: The dihedral angles in H2O2\mathrm{H_2O_2} in gaseous phase is 90.2∘90.2^\circ and in solid phase is 111.5∘111.5^\circ. Reason R\textbf{Reason R}: The change in dihedral angle in solid and gaseous phase is due to the difference in the intermolecular forces. Choose the most appropriate answer from the options given below for A and R.
Not attempted
A
A is correct but R is not correct.
B
Both A and R are correct but R is not the correct explanation of A.
C
Both A and R are correct and R is the correct explanation of A
D
A is not correct but R is correct.
413
[JEE Main 2021, 20 July Shift 1, Q44] The species given below that does NOT show disproportionation reaction is:
Not attempted
A
BrO−\mathrm{BrO^-}
B
BrO3−\mathrm{BrO_3^-}
C
BrO2−\mathrm{BrO_2^-}
D
BrO4−\mathrm{BrO_4^-}
414
[JEE Main 2021, 20 July Shift 1, Q56] 2SO2(g)+O2(g)⇌2SO3(g)2\mathrm{SO_2(g)} + \mathrm{O_2(g)} \rightleftharpoons 2\mathrm{SO_3(g)} In an equilibrium mixture, the partial pressures are PSO3=43 kPaP_{\mathrm{SO_3}} = 43\ \mathrm{kPa}; PO2=530 PaP_{\mathrm{O_2}} = 530\ \mathrm{Pa} and PSO2=45 kPaP_{\mathrm{SO_2}} = 45\ \mathrm{kPa}. The equilibrium constant Kp=K_p = _____________ ×10−2\times 10^{-2}. (Nearest integer)
Not attempted
Your answer: —
Correct answer: 172
415
[JEE Main 2021, 20 July Shift 1, Q52] An average person needs abut 1000010000 KJ energy per day. The amount of glucose (molar mass =180.0 g mol−1= 180.0\ \mathrm{g\ mol^{-1}}) needed to meet this energy requirement is_________ g, (Nearest integer) (Use : ΔcH∘\Delta_cH^\circ (glucose) =−2700 kJ mol−1= -2700\ \mathrm{kJ\ mol^{-1}})
Not attempted
Your answer: —
Correct answer: 667
416
[JEE Main 2021, 20 July Shift 1, Q51] The number of lone pairs of electrons on the central I atom in I3−\mathrm{I_3^-} is ___________.
Not attempted
Your answer: —
Correct answer: 3
417
[JEE Main 2021, 20 July Shift 1, Q60] The Azimuthal quantum number for the valence electrons of Ga+\mathrm{Ga^+} ion is____________. (Atomic number of Ga =31= 31)
Not attempted
Your answer: —
Correct answer: 0
418
[JEE Main 2021, 20 July Shift 1, Q57] 250 mL250\ \mathrm{mL} of 0.5 M0.5\ \mathrm{M} NaOH\mathrm{NaOH} was added to 500 mL500\ \mathrm{mL} of 1 M1\ \mathrm{M} HCl\mathrm{HCl}. The number of unreacted HCl\mathrm{HCl} molecules in the solution after complete reaction is__________ ×1021\times 10^{21}. (Nearest integer) NA=6.022×1023N_A = 6.022 \times 10^{23}
Not attempted
Your answer: —
Correct answer: 226
419
[JEE Main 2021, 18 March Shift 2, Q36] Match List-I with List-II: List-I (Class of Chemicals)List-II (Example)(a) Antifertility drug(i) Meprobamate(b) Antibiotic(ii) Alitame(c) Tranquilizer(iii) Norethindrone(d) Artificial Sweetener(iv) Salvarsan\displaystyle\begin{array}{|l|l|} \hline \textbf{List-I (Class of Chemicals)} & \textbf{List-II (Example)} \\ \hline \text{(a) Antifertility drug} & \text{(i) Meprobamate} \\ \text{(b) Antibiotic} & \text{(ii) Alitame} \\ \text{(c) Tranquilizer} & \text{(iii) Norethindrone} \\ \text{(d) Artificial Sweetener} & \text{(iv) Salvarsan} \\ \hline \end{array} Choose the most appropriate answer from the options given below:
Not attempted
A
(a)-(iv), (b)-(iii), (c)-(ii), (d)-(i)
B
(a)-(ii), (b)-(iii), (c)-(iv), (d)-(i)
C
(a)-(ii), (b)-(iv), (c)-(i), (d)-(iii)
D
(a)-(iii), (b)-(iv), (c)-(i), (d)-(ii)
420
[JEE Main 2021, 18 March Shift 2, Q45] Deficiency of vitamin K causes:
Not attempted
A
Cheilosis
B
Increase in blood clotting time
C
Increase in the fragility of RBCs
D
Decrease in blood clotting time
421
[JEE Main 2021, 18 March Shift 2, Q38] Consider the given reaction. The percentage yield of the products A, B and C (ortho-, meta- and para-nitroaniline, respectively) follows the order:
Not attempted
HNO₃, H₂SO₄288 K A+ B+ C
A
A>C>BA > C > B
B
B>C>AB > C > A
C
C>B>AC > B > A
D
C>A>BC > A > B
422
[JEE Main 2021, 18 March Shift 2, Q39] An organic compound "A" on treatment with benzene sulphonyl chloride gives compound B. B is soluble in dil. NaOH solution. Compound A is:
Not attempted
A
C6H5−N(CH3)2C_6H_5-N(CH_3)_2
B
C6H5−NHCH2CH3C_6H_5-NHCH_2CH_3
C
C6H5−CH(CH3)−NH2C_6H_5-CH(CH_3)-NH_2
D
C6H5−CH2−NHCH3C_6H_5-CH_2-NHCH_3
423
[JEE Main 2021, 18 March Shift 2, Q42] In the reaction of hypobromite with an amide, the carbonyl carbon is lost as:
Not attempted
A
HCO3−HCO_3^-
B
CO32−CO_3^{2-}
C
CO2CO_2
D
COCO
424
[JEE Main 2021, 18 March Shift 2, Q31] Consider the given reaction. The products "X" and "Y", respectively, are:
Not attempted
dil. NaOH"X"H⁺, Heat"Y"
A
(structure a)
and
B
(structure b)
and
C
(structure c)
and
D
(structure d)
and
425
[JEE Main 2021, 18 March Shift 2, Q59] In Tollen's test for aldehyde, the overall number of electron(s) transferred to the Tollen's reagent formula [Ag(NH3)2]+[Ag(NH_3)_2]^+ per aldehyde group to form silver mirror is ______. (Round off to the Nearest Integer)
Not attempted
Your answer: —
Correct answer: 2
426
[JEE Main 2021, 18 March Shift 2, Q37] The main products formed during the reaction of 11-methoxynaphthalene with hydroiodic acid are:
Not attempted
HIProducts ?
A
(structure a): 1-iodonaphthalene and CH3ICH_3I
andCH₃I
B
(structure b): 1-naphthol and CH3OHCH_3OH
andCH₃OH
C
(structure c): 1-iodonaphthalene and CH3OHCH_3OH
andCH₃OH
D
(structure d): 1-naphthol and CH3ICH_3I
andCH₃I
427
[JEE Main 2021, 18 March Shift 2, Q46] Given below are two statements: Statement I: C2H5OHC_2H_5OH and AgCNAgCN both can generate nucleophiles. Statement II: KCNKCN and AgCNAgCN both will generate nitrile nucleophiles with all reaction conditions. Choose the most appropriate option:
Not attempted
A
Statement I is false but statement II is true
B
Statement I is true but statement II is false
C
Both statement I and statement II are false
D
Both statement I and statement II are true
428
[JEE Main 2021, 18 March Shift 2, Q49] The secondary valency and the number of hydrogen bonded water molecule(s) in CuSO4⋅5H2OCuSO_4\cdot5H_2O, respectively, are:
Not attempted
A
66 and 44
B
44 and 11
C
55 and 11
D
66 and 55
429
[JEE Main 2021, 18 March Shift 2, Q33] The oxide that shows a magnetic property is:
Not attempted
A
SiO2SiO_2
B
Na2ONa_2O
C
Mn3O4Mn_3O_4
D
MgOMgO
430
[JEE Main 2021, 18 March Shift 2, Q35] Match List-I with List-II: List-IList-II(a) Mercury(i) Vapour phase refining(b) Copper(ii) Distillation refining(c) Silicon(iii) Electrolytic refining(d) Nickel(iv) Zone refining\displaystyle\begin{array}{|l|l|} \hline \textbf{List-I} & \textbf{List-II} \\ \hline \text{(a) Mercury} & \text{(i) Vapour phase refining} \\ \text{(b) Copper} & \text{(ii) Distillation refining} \\ \text{(c) Silicon} & \text{(iii) Electrolytic refining} \\ \text{(d) Nickel} & \text{(iv) Zone refining} \\ \hline \end{array} Choose the most appropriate answer from the options given below:
Not attempted
A
(a)-(ii), (b)-(iii), (c)-(i), (d)-(iv)
B
(a)-(ii), (b)-(iv), (c)-(iii), (d)-(ii)
C
(a)-(i), (b)-(iv), (c)-(ii), (d)-(iii)
D
(a)-(ii), (b)-(iii), (c)-(iv), (d)-(i)
431
[JEE Main 2021, 18 March Shift 2, Q32] The charges on the colloidal CdS sol and TiO2TiO_2 sol are, respectively:
Not attempted
A
positive and negative
B
negative and negative
C
negative and positive
D
positive and positive
432
[JEE Main 2021, 18 March Shift 2, Q53] A reaction has a half life of 11 min. The time required for 99.9%99.9\% completion of the reaction is ______ min. (Round off to the nearest integer) [Use: ln⁡2=0.69\ln 2=0.69, ln⁡10=2.3\ln 10=2.3]
Not attempted
Your answer: —
Correct answer: 10
433
[JEE Main 2021, 18 March Shift 2, Q52] The molar conductivities at infinite dilution of barium chloride, sulphuric acid and hydrochloric acid are 280280, 860860 and 426 S cm2 mol−1426\ S\ cm^2\ mol^{-1}, respectively. The molar conductivity at infinite dilution of barium sulphate is ______ S cm2 mol−1S\ cm^2\ mol^{-1}. (Round off to the Nearest Integer)
Not attempted
Your answer: —
Correct answer: 288
434
[JEE Main 2021, 18 March Shift 2, Q56] A solute AA dimerizes in water. The boiling point of a 22 molal solution of AA is 100.52∘C100.52^\circ C. The percentage association of AA is ______. (Round off to the nearest integer) [Use: KbK_b for water =0.52 K kg mol−1=0.52\ K\ kg\ mol^{-1}; boiling point of water =100∘C=100^\circ C]
Not attempted
Your answer: —
Correct answer: 100
435
[JEE Main 2021, 18 March Shift 2, Q48] A hard substance melts at high temperature and is an insulator in both solid and molten state. This solid is most likely to be a/an:
Not attempted
A
Metallic solid
B
Covalent solid
C
Ionic solid
D
Molecular solid
436
[JEE Main 2021, 18 March Shift 2, Q47] Given below are two statements: Statement I: Non-biodegradable wastes are generated by thermal power plants. Statement II: Biodegradable detergents lead to eutrophication. In the light of the above statements, choose the most appropriate answer from the options given below:
Not attempted
A
Statement I is false but statement II is true
B
Statement I is true but statement II is false
C
Both statement I and statement II are false
D
Both statement I and statement II are true
437
[JEE Main 2021, 18 March Shift 2, Q60] A xenon compound "A" upon partial hydrolysis gives XeO2F2XeO_2F_2. The number of lone pairs of electrons present in compound AA is ______. (Round off to the Nearest Integer)
Not attempted
Your answer: —
Correct answer: 19
438
[JEE Main 2021, 18 March Shift 2, Q44] Match List-I with List-II: List-IList-II(a) Be(i) Treatment of cancer(b) Mg(ii) Extraction of metals(c) Ca(iii) Incendiary bombs and signals(d) Ra(iv) Windows of X-ray tubes(v) Bearings for motor engines\displaystyle\begin{array}{|l|l|} \hline \textbf{List-I} & \textbf{List-II} \\ \hline \text{(a) Be} & \text{(i) Treatment of cancer} \\ \text{(b) Mg} & \text{(ii) Extraction of metals} \\ \text{(c) Ca} & \text{(iii) Incendiary bombs and signals} \\ \text{(d) Ra} & \text{(iv) Windows of X-ray tubes} \\ & \text{(v) Bearings for motor engines} \\ \hline \end{array} Choose the most appropriate answer from the options given below:
Not attempted
A
(a)-(iii), (b)-(iv), (c)-(ii), (d)-(v)
B
(a)-(iv), (b)-(iii), (c)-(i), (d)-(ii)
C
(a)-(iv), (b)-(iii), (c)-(ii), (d)-(i)
D
(a)-(iii), (b)-(iv), (c)-(v), (d)-(ii)
439
[JEE Main 2021, 18 March Shift 2, Q50] In a basic medium, H2O2H_2O_2 exhibits which of the following reactions? (A) Mn2+→Mn4+Mn^{2+} \rightarrow Mn^{4+} (B) I2→I−I_2 \rightarrow I^- (C) PbS→PbSO4PbS \rightarrow PbSO_4
Not attempted
A
(A), (C) only
B
(A) only
C
(B) only
D
(A), (B) only
440
[JEE Main 2021, 18 March Shift 2, Q43] The oxidation states of nitrogen in NONO, NO2NO_2, N2ON_2O and NO3−NO_3^- are in the order of:
Not attempted
A
NO2>NO3−>NO>N2ONO_2 > NO_3^- > NO > N_2O
B
N2O>NO2>NO>NO3−N_2O > NO_2 > NO > NO_3^-
C
NO3−>NO2>NO>N2ONO_3^- > NO_2 > NO > N_2O
D
NO>NO2>NO3−>N2ONO > NO_2 > NO_3^- > N_2O
441
[JEE Main 2021, 18 March Shift 2, Q51] The solubility of CdSO4CdSO_4 in water is 8.0×10−4 mol L−18.0\times10^{-4}\ mol\ L^{-1}. Its solubility in 0.01 M H2SO40.01\ M\ H_2SO_4 solution is ______ ×10−6 mol L−1\times10^{-6}\ mol\ L^{-1}. (Round off to the Nearest Integer) (Assume that solubility is much less than 0.01 M0.01\ M)
Not attempted
Your answer: —
Correct answer: 64
442
[JEE Main 2021, 18 March Shift 2, Q54] The gas phase reaction 2A(g)⇌A2(g)2A(g)\rightleftharpoons A_2(g) at 400 K400\ K has ΔG∘=+25.2 kJ mol−1\Delta G^\circ=+25.2\ kJ\ mol^{-1}. The equilibrium constant KCK_C for this reaction is ______ ×10−2\times10^{-2}. (Round off to the Nearest Integer) [Use: R=8.3 J mol−1K−1R=8.3\ J\ mol^{-1}K^{-1}, ln⁡10=2.3\ln10=2.3, log⁡102=0.30\log_{10}2=0.30, 1 atm=1 bar1\ atm=1\ bar] [antilog(−0.3)=0.501(-0.3)=0.501]
Not attempted
Your answer: —
Correct answer: 2
443
[JEE Main 2021, 18 March Shift 2, Q41] In the following molecule, the hybridisation of carbon a, b and c, respectively, are:
Not attempted
A
sp3, sp2, sp2sp^3,\ sp^2,\ sp^2
B
sp3, sp2, spsp^3,\ sp^2,\ sp
C
sp3, sp, spsp^3,\ sp,\ sp
D
sp3, sp, sp2sp^3,\ sp,\ sp^2
444
[JEE Main 2021, 18 March Shift 2, Q57] The number of species below that have two lone pairs of electrons in their central atom is ______. (Round off to the Nearest Integer) SF4SF_4, BF4−BF_4^-, ClF3ClF_3, AsF3AsF_3, PCl5PCl_5, BrF5BrF_5, XeF4XeF_4, SF6SF_6
Not attempted
Your answer: —
Correct answer: 2
445
[JEE Main 2021, 18 March Shift 2, Q40] The first ionization energy of magnesium is smaller as compared to that of elements X and Y, but higher than that of Z. The elements X, Y and Z, respectively, are:
Not attempted
A
argon, lithium and sodium
B
chlorine, lithium and sodium
C
neon, sodium and chlorine
D
argon, chlorine and sodium
446
[JEE Main 2021, 18 March Shift 2, Q34] Given below are two statements: Statement I: Bohr's theory accounts for the stability and line spectrum of Li+Li^+ ion. Statement II: Bohr's theory was unable to explain the splitting of spectral lines in the presence of a magnetic field. In the light of the above statements, choose the most appropriate answer from the options given below:
Not attempted
A
Both statement I and statement II are true
B
Statement I is true but statement II is false
C
Statement I is false but statement II is true
D
Both statement I and statement II are false
447
[JEE Main 2021, 18 March Shift 2, Q55] Consider the below reaction where 6.1 g6.1\ g of benzoic acid is used to get 7.8 g7.8\ g of mm-bromobenzoic acid. The percentage yield of the product is ______. (Round off to the nearest integer) [Given: Atomic masses: C:12.0 uC:12.0\ u, H:1.0 uH:1.0\ u, O:16.0 uO:16.0\ u, Br:80.0 uBr:80.0\ u]
Not attempted
+ Br₂FeBr₃ + HBr
Your answer: —
Correct answer: 78
448
[JEE Main 2021, 18 March Shift 2, Q58] 10.0 mL10.0\ mL of Na2CO3Na_2CO_3 solution is titrated against 0.2 M HCl0.2\ M\ HCl solution. The following titre values were obtained in 55 readings: 4.8 mL4.8\ mL, 4.9 mL4.9\ mL, 5.0 mL5.0\ mL, 5.0 mL5.0\ mL and 5.0 mL5.0\ mL. Based on these readings, and the convention of titrimetric estimation, the concentration of Na2CO3Na_2CO_3 solution is ______ mMmM. (Round off to the Nearest Integer)
Not attempted
Your answer: —
Correct answer: 50
449
[JEE Main 2021, 18 March Shift 1, Q37] Match List-I with List-II: List-I (Class of Drug)List-II (Example)(a) Antacid(i) Novestrol(b) Artificial Sweetener(ii) Cimetidine(c) Antifertility(iii) Valium(d) Tranquilizers(iv) Alitame\displaystyle\begin{array}{|l|l|} \hline \textbf{List-I (Class of Drug)} & \textbf{List-II (Example)} \\ \hline \text{(a) Antacid} & \text{(i) Novestrol} \\ \text{(b) Artificial Sweetener} & \text{(ii) Cimetidine} \\ \text{(c) Antifertility} & \text{(iii) Valium} \\ \text{(d) Tranquilizers} & \text{(iv) Alitame} \\ \hline \end{array} Choose the most appropriate answer from the options given below:
Not attempted
A
(a)-(iv), (b)-(iii), (c)-(i), (d)-(ii)
B
(a)-(ii), (b)-(iv), (c)-(i), (d)-(iii)
C
(a)-(ii), (b)-(iv), (c)-(iii), (d)-(i)
D
(a)-(iv), (b)-(i), (c)-(ii), (d)-(iii)
450
[JEE Main 2021, 18 March Shift 1, Q49] A non-reducing sugar "A" hydrolyses to give two reducing monosaccharides. Sugar A is:
Not attempted
A
Glucose
B
Fructose
C
Sucrose
D
Galactose
451
[JEE Main 2021, 18 March Shift 1, Q47] Considering the below reaction, X and Y respectively are:
Not attempted
NaNO₂ + HCl273 K - 278 K"X"(Major Product) "Y"(Major Product)
A
(structures a)
and
B
(structures b)
and
C
(structures c)
and
D
(structures d)
and
452
[JEE Main 2021, 18 March Shift 1, Q55] A reaction of 0.10.1 mole of benzyl amine with bromomethane gave 23 g23\ g of benzyl trimethyl ammonium bromide. The number of moles of bromomethane consumed in this reaction are n×10−1n\times10^{-1}, when n=n= ______. (Round off to the nearest integer) [Given: atomic masses: C:12.0 uC: 12.0\ u, H:1.0 uH: 1.0\ u, N:14.0 uN: 14.0\ u, Br:80.0 uBr: 80.0\ u]
Not attempted
Your answer: —
Correct answer: 3
453
[JEE Main 2021, 18 March Shift 1, Q43] Consider the above chemical reaction and identify product "A":
Not attempted
H₂OH⁺"A"(Major Product)H₂OH⁺, Δ
A
(structure a)
B
(structure b)
C
(structure c)
D
(structure d)
454
[JEE Main 2021, 18 March Shift 1, Q48] Reaction of Grignard reagent, C2H5MgBrC_2H_5MgBr with C8H8OC_8H_8O followed by hydrolysis gives compound "A" which reacts instantly with Lucas reagent to give compound B, C10H13ClC_{10}H_{13}Cl. The compound B is:
Not attempted
A
(structure a)
B
(structure b)
C
(structure c)
D
(structure d)
455
[JEE Main 2021, 18 March Shift 1, Q39] The correct structures of trans-[NiBr2(PPh3)2][NiBr_2(PPh_3)_2] and meridional-[Co(NH3)3(NO2)3][Co(NH_3)_3(NO_2)_3] respectively are:
Not attempted
A
(structure a)
NiPh₃PBrBrPPh₃andCoNO₂NH₃H₃NNO₂H₃NNO₂
B
(structure b)
NiPh₃PBrBrPPh₃andCoNO₂NH₃H₃NNO₂O₂NNH₃
C
(structure c)
NiPh₃PBrPh₃PBrandCoNH₃NH₃O₂NNH₃O₂NNO₂
D
(structure d)
NiPh₃PBrPh₃PBrandCoNO₂NH₃O₂NNH₃O₂NNH₃
456
[JEE Main 2021, 18 March Shift 1, Q40] Match List-I with List-II: List-IList-II(a) Chlorophyll(i) Ruthenium(b) Vitamin-B12(ii) Platinum(c) Anticancer drug(iii) Cobalt(d) Grubbs catalyst(iv) Magnesium\displaystyle\begin{array}{|l|l|} \hline \textbf{List-I} & \textbf{List-II} \\ \hline \text{(a) Chlorophyll} & \text{(i) Ruthenium} \\ \text{(b) Vitamin-B}_{12} & \text{(ii) Platinum} \\ \text{(c) Anticancer drug} & \text{(iii) Cobalt} \\ \text{(d) Grubbs catalyst} & \text{(iv) Magnesium} \\ \hline \end{array} Choose the most appropriate answer from the options given below:
Not attempted
A
(a)-(iv), (b)-(iii), (c)-(i), (d)-(ii)
B
(a)-(iii), (b)-(ii), (c)-(iv), (d)-(i)
C
(a)-(iv), (b)-(iii), (c)-(ii), (d)-(i)
D
(a)-(iv), (b)-(ii), (c)-(iii), (d)-(i)
457
[JEE Main 2021, 18 March Shift 1, Q52] The total number of unpaired electrons present in the complex K3[Cr(oxalate)3]K_3[Cr(oxalate)_3] is ______.
Not attempted
Your answer: —
Correct answer: 3
458
[JEE Main 2021, 18 March Shift 1, Q45] The chemical added to reduce the melting point of the reaction mixture during the extraction of aluminium is:
Not attempted
A
Cryolite
B
Calamine
C
Kaolite
D
Bauxite
459
[JEE Main 2021, 18 March Shift 1, Q50] Match List-I with List-II: List-I (Process)List-II (Catalyst)(a) Deacon’s process(i) ZSM-5(b) Contact process(ii) CuCl2(c) Cracking of hydrocarbons(iii) Finely divided Ni(d) Hydrogenation of vegetable oils(iv) V2O5\displaystyle\begin{array}{|l|l|} \hline \textbf{List-I (Process)} & \textbf{List-II (Catalyst)} \\ \hline \text{(a) Deacon’s process} & \text{(i) ZSM-5} \\ \text{(b) Contact process} & \text{(ii) } CuCl_2 \\ \text{(c) Cracking of hydrocarbons} & \text{(iii) Finely divided Ni} \\ \text{(d) Hydrogenation of vegetable oils} & \text{(iv) } V_2O_5 \\ \hline \end{array} Choose the most appropriate answer from the options given below:
Not attempted
A
(a)-(i), (b)-(iii), (c)-(ii), (d)-(iv)
B
(a)-(iv), (b)-(ii), (c)-(i), (d)-(iii)
C
(a)-(ii), (b)-(iv), (c)-(i), (d)-(iii)
D
(a)-(iii), (b)-(i), (c)-(iv), (d)-(ii)
460
[JEE Main 2021, 18 March Shift 1, Q56] 2NO(g)+Cl2(g)→2NOCl(s)2NO(g)+Cl_2(g)\rightarrow 2NOCl(s). This reaction was studied at −10 ∘C-10\ ^\circ C and the following data was obtained. Run[NO]0[Cl2]0r010.100.100.1820.100.200.3530.200.201.40\displaystyle\begin{array}{|c|c|c|c|} \hline \text{Run} & [NO]_0 & [Cl_2]_0 & r_0 \\ \hline 1 & 0.10 & 0.10 & 0.18 \\ 2 & 0.10 & 0.20 & 0.35 \\ 3 & 0.20 & 0.20 & 1.40 \\ \hline \end{array} [NO]0[NO]_0 and [Cl2]0[Cl_2]_0 are the initial concentrations and r0r_0 is the initial reaction rate. The overall order of the reaction is ______. (Round off to the nearest integer)
Not attempted
Your answer: —
Correct answer: 3
461
[JEE Main 2021, 18 March Shift 1, Q57] For the reaction 2Fe3+(aq)+2I−(aq)→2Fe2+(aq)+I2(s)2Fe^{3+}(aq)+2I^-(aq)\rightarrow2Fe^{2+}(aq)+I_2(s), the magnitude of the standard molar free energy change, ΔrGm∘=−\Delta_rG^\circ_m=- ______ kJ. (Round off to the nearest integer) EFe2+/Fe(s)∘=−0.440 V; EFe3+/Fe(s)∘=−0.036 V; EI2/2I−∘=0.539 V; F=96500 CE^\circ_{Fe^{2+}/Fe(s)}=-0.440\ V;\ E^\circ_{Fe^{3+}/Fe(s)}=-0.036\ V;\ E^\circ_{I_2/2I^-}=0.539\ V;\ F=96500\ C
Not attempted
Your answer: —
Correct answer: 45
462
[JEE Main 2021, 18 March Shift 1, Q51] 22 molal solution of a weak acid HAHA has a freezing point of −3.885 ∘C-3.885\ ^\circ C. The degree of dissociation of this acid is ______ × 10−3\times\ 10^{-3}. (Round off to the nearest integer) [Given: molal depression constant of water =1.85 K kg mol−1=1.85\ K\,kg\,mol^{-1}; freezing point of pure water =0 ∘C=0\ ^\circ C]
Not attempted
Your answer: —
Correct answer: 50
463
[JEE Main 2021, 18 March Shift 1, Q36] In a binary compound, atoms of element A form a hcp structure and those of element M occupy 23\dfrac{2}{3} of the tetrahedral voids of the hcp structure. The formula of the binary compound is:
Not attempted
A
M2A3M_2A_3
B
MA3MA_3
C
M4AM_4A
D
M4A3M_4A_3
464
[JEE Main 2021, 18 March Shift 1, Q33] The statements that are TRUE: (A) methane leads to both global warming and photochemical smog (B) methane is generated from paddy fields (C) methane is a stronger global warming gas than CO2CO_2 (D) methane is a part of reducing smog Choose the most appropriate answer from the options given below:
Not attempted
A
(B), (C), (D) only
B
(A), (B), (C) only
C
(A), (B), (D) only
D
(A) and (B) only
465
[JEE Main 2021, 18 March Shift 1, Q32] Match List-I with List-II: List-I (Chemicals)List-II (Use/Preparation/Constituent)(a) Alcoholic potassium hydroxide(i) electrodes in batteries(b) Pd/BaSO4(ii) obtained by addition reaction(c) BHC (Benzene hexachloride)(iii) used for β-elimination reaction(d) Polyacetylene(iv) Lindlar’s Catalyst\displaystyle\begin{array}{|l|l|} \hline \textbf{List-I (Chemicals)} & \textbf{List-II (Use/Preparation/Constituent)} \\ \hline \text{(a) Alcoholic potassium hydroxide} & \text{(i) electrodes in batteries} \\ \text{(b) } Pd/BaSO_4 & \text{(ii) obtained by addition reaction} \\ \text{(c) BHC (Benzene hexachloride)} & \text{(iii) used for } \beta\text{-elimination reaction} \\ \text{(d) Polyacetylene} & \text{(iv) Lindlar’s Catalyst} \\ \hline \end{array} Choose the most appropriate match:
Not attempted
A
(a)-(ii), (b)-(i), (c)-(iv), (d)-(iii)
B
(a)-(iii), (b)-(i), (c)-(iv), (d)-(ii)
C
(a)-(ii), (b)-(iv), (c)-(i), (d)-(iii)
D
(a)-(iii), (b)-(iv), (c)-(ii), (d)-(i)
466
[JEE Main 2021, 18 March Shift 1, Q46] Considering the below chemical reaction, identify the product "X":
Not attempted
Alkaline KMnO₄H⁺"X"
A
(structure a)
B
(structure b)
C
(structure c)
D
(structure d)
467
[JEE Main 2021, 18 March Shift 1, Q34] Compound with molecular formula C3H6OC_3H_6O can show:
Not attempted
A
Both positional isomerism and metamerism
B
Metamerism
C
Positional isomerism
D
Functional group isomerism
468
[JEE Main 2021, 18 March Shift 1, Q38] Reagent, 1-naphthylamine and sulphanilic acid in acetic acid is used for the detection of:
Not attempted
A
NONO
B
N2ON_2O
C
NO3−NO_3^-
D
NO2−NO_2^-
469
[JEE Main 2021, 18 March Shift 1, Q41] The number of ionisable hydrogens present in the product obtained from a reaction of phosphorus trichloride and phosphonic acid is:
Not attempted
A
33
B
11
C
00
D
22
470
[JEE Main 2021, 18 March Shift 1, Q35] Match List-I with List-II: List-IList-II(a) Ca(OCl)2(i) Antacid(b) CaSO4⋅12H2O(ii) Cement(c) CaO(iii) Bleach(d) CaCO3(iv) Plaster of Paris\displaystyle\begin{array}{|l|l|} \hline \textbf{List-I} & \textbf{List-II} \\ \hline \text{(a) } Ca(OCl)_2 & \text{(i) Antacid} \\ \text{(b) } CaSO_4\cdot\tfrac{1}{2}H_2O & \text{(ii) Cement} \\ \text{(c) } CaO & \text{(iii) Bleach} \\ \text{(d) } CaCO_3 & \text{(iv) Plaster of Paris} \\ \hline \end{array} Choose the most appropriate answer from the options given below:
Not attempted
A
(a)-(iii), (b)-(iv), (c)-(ii), (d)-(i)
B
(a)-(iii), (b)-(ii), (c)-(iv), (d)-(i)
C
(a)-(iii), (b)-(ii), (c)-(i), (d)-(iv)
D
(a)-(i), (b)-(iv), (c)-(iii), (d)-(ii)
471
[JEE Main 2021, 18 March Shift 1, Q44] Given below are two statements: One is labelled as Assertion A and the other is labelled as Reason R. Assertion A: During the boiling of water having temporary hardness, Mg(HCO3)2Mg(HCO_3)_2 is converted to MgCO3MgCO_3. Reason R: The solubility product of Mg(OH)2Mg(OH)_2 is greater than that of MgCO3MgCO_3. In the light of the above statements, choose the most appropriate answer from the options given below:
Not attempted
A
A is false but R is true
B
Both A and R are true and R is the correct explanation of A
C
Both A and R are true but R is NOT the correct explanation of A
D
A is true but R is false
472
[JEE Main 2021, 18 March Shift 1, Q59] In order to prepare a buffer solution of pH 5.74pH\ 5.74, sodium acetate is added to acetic acid. If the concentration of acetic acid in the buffer is 1.0 M1.0\ M, the concentration of sodium acetate in the buffer is ______ MM. (Round off to the nearest integer) [Given: pKapK_a (acetic acid) =4.74=4.74]
Not attempted
Your answer: —
Correct answer: 10
473
[JEE Main 2021, 18 March Shift 1, Q58] For the reaction C2H6→C2H4+H2C_2H_6\rightarrow C_2H_4+H_2, the reaction enthalpy ΔrH=\Delta_rH= ______ kJ mol−1kJ\,mol^{-1}. (Round off to the nearest integer) [Given: bond enthalpies in kJ mol−1kJ\,mol^{-1}: C−C:347C-C: 347, C=C:611C=C: 611, C−H:414C-H: 414, H−H:436H-H: 436]
Not attempted
Your answer: —
Correct answer: 128
474
[JEE Main 2021, 18 March Shift 1, Q53] AXAX is a covalent diatomic molecule where AA and XX are second-row elements of the periodic table. Based on Molecular orbital theory, the bond order of AXAX is 2.52.5. The total number of electrons in AXAX is ______. (Round off to the nearest integer)
Not attempted
Your answer: —
Correct answer: 15
475
[JEE Main 2021, 18 March Shift 1, Q31] The ionic radius of Na+Na^+ ion is 1.02 A˚1.02\ \text{\AA}. The ionic radii (in A˚\text{\AA}) of Mg2+Mg^{2+} and Al3+Al^{3+}, respectively are:
Not attempted
A
0.720.72 and 0.540.54
B
0.680.68 and 0.720.72
C
1.051.05 and 0.990.99
D
0.850.85 and 0.990.99
476
[JEE Main 2021, 18 March Shift 1, Q42] A certain orbital has no angular nodes and two radial nodes. The orbital is:
Not attempted
A
2p2p
B
3p3p
C
2s2s
D
3s3s
477
[JEE Main 2021, 18 March Shift 1, Q54] ______ grams of 3-hydroxypropanal (MW =74=74) must be dehydrated to produce 7.8 g7.8\ g of acrolein (MW =56=56) (C3H4O)(C_3H_4O) if the percentage yield is 6464. (Round off to the nearest integer) [Given: atomic masses: C:12.0 uC: 12.0\ u, H:1.0 uH: 1.0\ u, O:16.0 uO: 16.0\ u]
Not attempted
Your answer: —
Correct answer: 16
478
[JEE Main 2021, 18 March Shift 1, Q60] Complete combustion of 3 g3\ g of ethane gives x×1022x\times10^{22} molecules of water. The value of xx is ______. (Round off to the nearest integer) [Use: NA=6.023×1023N_A=6.023\times10^{23}; atomic masses in uu: C:12.0C:12.0; O:16.0O:16.0; H:1.0H:1.0]
Not attempted
Your answer: —
Correct answer: 18
479
[JEE Main 2021, 17 March Shift 2, Q31] Match List-I with List-II. List-I (Chemical Compound)List-II (Used as)(a) Sucralose(i) Synthetic detergent(b) Glyceryl ester of stearic acid(ii) Artificial sweetener(c) Sodium benzoate(iii) Antiseptic(d) Bithionol(iv) Food preservative\displaystyle\begin{array}{|l|l|} \hline \textbf{List-I (Chemical Compound)} & \textbf{List-II (Used as)} \\ \hline \text{(a) Sucralose} & \text{(i) Synthetic detergent} \\ \text{(b) Glyceryl ester of stearic acid} & \text{(ii) Artificial sweetener} \\ \text{(c) Sodium benzoate} & \text{(iii) Antiseptic} \\ \text{(d) Bithionol} & \text{(iv) Food preservative} \\ \hline \end{array} Choose the correct match:
Not attempted
A
(a)-(i), (b)-(ii), (c)-(iv), (d)-(iii)
B
(a)-(ii), (b)-(i), (c)-(iv), (d)-(iii)
C
(a)-(iv), (b)-(iii), (c)-(ii), (d)-(i)
D
(a)-(iii), (b)-(ii), (c)-(iv), (d)-(i)
480
[JEE Main 2021, 17 March Shift 2, Q32] In the below reactions, enzyme A and enzyme B respectively are: C12H22O11+H2O→Enzyme AC6H12O6+C6H12O6(Glucose + Fructose)C_{12}H_{22}O_{11} + H_2O \xrightarrow{\text{Enzyme A}} C_6H_{12}O_6 + C_6H_{12}O_6 \quad (\text{Glucose + Fructose}) C6H12O6→Enzyme B2C2H5OH+2CO2(from Glucose)C_6H_{12}O_6 \xrightarrow{\text{Enzyme B}} 2C_2H_5OH + 2CO_2 \quad (\text{from Glucose})
Not attempted
A
Invertase and Amylase
B
Amylase and Invertase
C
Invertase and Zymase
D
Zymase and Invertase
481
[JEE Main 2021, 17 March Shift 2, Q44] Fructose is an example of:
Not attempted
A
Heptose
B
Aldohexose
C
Pyranose
D
Ketohexose
482
[JEE Main 2021, 17 March Shift 2, Q43] In the below reaction, the structural formula of (A), "X" and "Y" respectively are:
Not attempted
C₇H₇N₂OCl(A)+ C₂H₅OH + N₂ + “X” + “Y”
A
Structures as shown in figure (a)
,OHHHH,H₂O
B
Structures as shown in figure (b)
, ,HCl
C
Structures as shown in figure (c)
,OHHHH,HCl
D
Structure as shown in figure (d)
, ,H₂O
483
[JEE Main 2021, 17 March Shift 2, Q46] Primary, secondary and tertiary amines can be separated using:
Not attempted
A
Para-Toluene sulphonyl chloride
B
Chloroform and KOH
C
Acetyl amide
D
Benzene sulphonic acid
484
[JEE Main 2021, 17 March Shift 2, Q33] The correct pair(s) of the ambident nucleophiles is (are): (A) AgCN/KCNAgCN/KCN (B) RCOOAg/RCOOKRCOOAg/RCOOK (C) AgNO2/KNO2AgNO_2/KNO_2 (D) AgI/KIAgI/KI
Not attempted
A
(A) and (C) only
B
(B) only
C
(B) and (C) only
D
(A) only
485
[JEE Main 2021, 17 March Shift 2, Q35] Match List-I with List-II: List-IList-II(a) [Co(NH3)6][Cr(CN)6](i) Linkage isomerism(b) [Co(NH3)3(NO2)3](ii) Solvate isomerism(c) [Cr(H2O)6]Cl3(iii) Coordination isomerism(d) cis-[CrCl2(ox)2]3−(iv) Optical isomerism\displaystyle\begin{array}{|l|l|} \hline \textbf{List-I} & \textbf{List-II} \\ \hline \text{(a) } [Co(NH_3)_6][Cr(CN)_6] & \text{(i) Linkage isomerism} \\ \text{(b) } [Co(NH_3)_3(NO_2)_3] & \text{(ii) Solvate isomerism} \\ \text{(c) } [Cr(H_2O)_6]Cl_3 & \text{(iii) Coordination isomerism} \\ \text{(d) } cis\text{-}[CrCl_2(ox)_2]^{3-} & \text{(iv) Optical isomerism} \\ \hline \end{array} Choose the correct answer from the options given below:
Not attempted
A
(a)-(iii), (b)-(i), (c)-(ii), (d)-(iv)
B
(a)-(i), (b)-(ii), (c)-(iii), (d)-(iv)
C
(a)-(ii), (b)-(i), (c)-(iii), (d)-(iv)
D
(a)-(iv), (b)-(ii), (c)-(iii), (d)-(i)
486
[JEE Main 2021, 17 March Shift 2, Q54] On complete reaction of FeCl3FeCl_3 with oxalic acid in an aqueous solution containing KOHKOH, resulted in the formation of product A. The secondary valency of FeFe in the product A is ______. (Round off to the Nearest Integer)
Not attempted
Your answer: —
Correct answer: 6
487
[JEE Main 2021, 17 March Shift 2, Q36] The common positive oxidation states for an element with atomic number 2424, are
Not attempted
A
+1+1 and +3+3
B
+1+1 to +6+6
C
+1+1 and +3+3 to +6+6
D
+2+2 to +6+6
488
[JEE Main 2021, 17 March Shift 2, Q52] In the ground state of atomic FeFe (Z=26Z = 26), the spin-only magnetic moment is ______ × 10−1\times\,10^{-1} BM. (Round off to the Nearest Integer). [Given: 3=1.73\sqrt{3} = 1.73, 2=1.41\sqrt{2} = 1.41]
Not attempted
Your answer: —
Correct answer: 49
489
[JEE Main 2021, 17 March Shift 2, Q47] Match List-I with List-II List-IList-II(a) Haematite(i) Al2O3⋅xH2O(b) Bauxite(ii) Fe2O3(c) Magnetite(iii) CuCO3⋅Cu(OH)2(d) Malachite(iv) Fe3O4\displaystyle\begin{array}{|l|l|} \hline \textbf{List-I} & \textbf{List-II} \\ \hline \text{(a) Haematite} & \text{(i) } Al_2O_3\cdot xH_2O \\ \text{(b) Bauxite} & \text{(ii) } Fe_2O_3 \\ \text{(c) Magnetite} & \text{(iii) } CuCO_3\cdot Cu(OH)_2 \\ \text{(d) Malachite} & \text{(iv) } Fe_3O_4 \\ \hline \end{array} Choose the correct answer from the options given below:
Not attempted
A
(a)-(ii), (b)-(iii), (c)-(i), (d)-(iv)
B
(a)-(iv), (b)-(i), (c)-(ii), (d)-(iii)
C
(a)-(i), (b)-(iii), (c)-(ii), (d)-(iv)
D
(a)-(ii), (b)-(i), (c)-(iv), (d)-(iii)
490
[JEE Main 2021, 17 March Shift 2, Q40] For the coagulation of a negative sol, the species below, that has the highest flocculating power is:
Not attempted
A
SO42−SO_4^{2-}
B
Na+Na^+
C
Ba2+Ba^{2+}
D
PO43−PO_4^{3-}
491
[JEE Main 2021, 17 March Shift 2, Q51] The reaction 2A+B2→2AB2A + B_2 \rightarrow 2AB is an elementary reaction. For a certain quantity of reactants, if the volume of the reaction vessel is reduced by a factor of 33, the rate of the reaction increases by a factor of ______. (Round off to the Nearest Integer).
Not attempted
Your answer: —
Correct answer: 27
492
[JEE Main 2021, 17 March Shift 2, Q56] A KClKCl solution of conductivity 0.14 S m−10.14\ S\,m^{-1} shows a resistance of 4.19 Ω4.19\ \Omega in a conductivity cell. If the same cell is filled with an HClHCl solution, the resistance drops to 1.03 Ω1.03\ \Omega. The conductivity of the HClHCl solution is ______ × 10−2 S m−1\times\,10^{-2}\ S\,m^{-1}. (Round off to the Nearest Integer).
Not attempted
Your answer: —
Correct answer: 57
493
[JEE Main 2021, 17 March Shift 2, Q57] A 11 molal K4Fe(CN)6K_4Fe(CN)_6 solution has a degree of dissociation of 0.40.4. Its boiling point is equal to that of another solution which contains 18.118.1 weight per cent of a nonelectrolyte solute A. The molar mass of A is ______ g/mol. (Round off to the Nearest Integer).
Not attempted
Your answer: —
Correct answer: 85
494
[JEE Main 2021, 17 March Shift 2, Q59] KBrKBr is doped with 10−510^{-5} mole per cent of SrBr2SrBr_2. The number of cationic vacancies in 11 g of KBrKBr crystal is ______ × 1014\times\,10^{14}. (Round off to the Nearest Integer). [Atomic Mass: K = 39.1 u, Br = 79.9 u, NA=6.023×1023N_A = 6.023\times10^{23}]
Not attempted
Your answer: —
Correct answer: 5
495
[JEE Main 2021, 17 March Shift 2, Q45] Which of the following statement(s) is (are) the incorrect reason for eutrophication? (A) excess usage of fertilisers (B) excess usage of detergents (C) dense plant population in water bodies (D) lack of nutrients in water bodies that prevent plant growth Choose the most appropriate answer from the option given below:
Not attempted
A
(D) only
B
(C) only
C
(B) and (D) only
D
(A) only
496
[JEE Main 2021, 17 March Shift 2, Q38] Given below are two statements: Statement I: 2-methylbutane on oxidation with KMnO4KMnO_4 gives 2-methylbutan-2-ol. Statement II: nn-alkanes can be easily oxidized to corresponding alcohols with KMnO4KMnO_4. Choose the correct option:
Not attempted
A
Both statement I and statement II are incorrect
B
Statement I is correct but statement II is incorrect
C
Both statement I and statement II are correct
D
Statement I is incorrect but statement II is correct
497
[JEE Main 2021, 17 March Shift 2, Q42] Choose the correct statement regarding the formation of carbocations A and B given. CH3−CH2−CH=CH2+HBr→CH_3-CH_2-CH=CH_2 + HBr \rightarrow A: CH3−CH2−CH2−C+H2+Br−CH_3-CH_2-CH_2-\overset{+}{C}H_2 + Br^- B: CH3−CH2−C+H−CH3+Br−CH_3-CH_2-\overset{+}{C}H-CH_3 + Br^-
Not attempted
A
Carbocation A is more stable and formed relatively at a faster rate
B
Carbocation B is more stable and formed relatively at a faster rate
C
Carbocation A is more stable and formed relatively at a slow rate
D
Carbocation B is more stable and formed relatively at a slow rate
498
[JEE Main 2021, 17 March Shift 2, Q49] Nitrogen can be estimated by Kjeldahl's method for which of the following compound?
Not attempted
A
Structure as shown in figure (a)
B
Structure as shown in figure (b)
C
Structure as shown in figure (c)
D
Structure as shown in figure (d)
499
[JEE Main 2021, 17 March Shift 2, Q60] The total number of C-C sigma bond/s in mesityl oxide (C6H10OC_6H_{10}O) is ______. (Round off to the Nearest Integer).
Not attempted
Your answer: —
Correct answer: 5
500
[JEE Main 2021, 17 March Shift 2, Q48] The set that represents the pair of neutral oxides of nitrogen is:
Not attempted
A
NONO and N2ON_2O
B
NONO and NO2NO_2
C
N2ON_2O and NO2NO_2
D
N2ON_2O and N2O3N_2O_3
501
[JEE Main 2021, 17 March Shift 2, Q37] The set of elements that differ in a mutual relationship from those of the other sets is:
Not attempted
A
Be−AlBe - Al
B
Li−NaLi - Na
C
B−SiB - Si
D
Li−MgLi - Mg
502
[JEE Main 2021, 17 March Shift 2, Q50] One of the by-products formed during the recovery of NH3NH_3 from Solvay process is:
Not attempted
A
NaHCO3NaHCO_3
B
Ca(OH)2Ca(OH)_2
C
CaCl2CaCl_2
D
NH4ClNH_4Cl
503
[JEE Main 2021, 17 March Shift 2, Q41] The functional groups that are responsible for the ion-exchange property of cation and anion exchange resins, respectively, are:
Not attempted
A
−SO3H-SO_3H and −COOH-COOH
B
−SO3H-SO_3H and −NH2-NH_2
C
−NH2-NH_2 and −SO3H-SO_3H
D
−NH2-NH_2 and −COOH-COOH
504
[JEE Main 2021, 17 March Shift 2, Q55] Consider the reaction N2O4(g)⇌2NO2(g)N_2O_4(g) \rightleftharpoons 2NO_2(g). The temperature at which KC=20.4K_C = 20.4 and KP=600.1K_P = 600.1, is ______ K. (Round off to the Nearest Integer). [Assume all gases are ideal and R=0.0831R = 0.0831 L bar K−1^{-1} mol−1^{-1}]
Not attempted
Your answer: —
Correct answer: 354
505
[JEE Main 2021, 17 March Shift 2, Q34] During which of the following processes, does entropy decrease? (A) Freezing of water to ice at 0∘C0^\circ C (B) Freezing of water to ice at −10∘C-10^\circ C (C) N2(g)+3H2(g)→2NH3(g)N_2(g) + 3H_2(g) \rightarrow 2NH_3(g) (D) Adsorption of CO(g)CO(g) on lead surface (E) Dissolution of NaClNaCl in water
Not attempted
A
(A), (B), (C) and (D) only
B
(A), (C) and (E) only
C
(A) and (E) only
D
(B) and (C) only
506
[JEE Main 2021, 17 March Shift 2, Q39] Amongst the following, the linear species is:
Not attempted
A
N3−N_3^-
B
Cl2OCl_2O
C
O3O_3
D
NO2NO_2
507
[JEE Main 2021, 17 March Shift 2, Q53] Consider the below reaction. The percentage yield of an amide product is ______. (Round off to the Nearest Integer). [Given: Atomic mass: C: 12.0 u, H: 1.0 u, N: 14.0 u, O: 16.0 u, Cl: 35.5 u]
Not attempted
0.140 g+ 0.388 g 0.210 g
Your answer: —
Correct answer: 77
508
[JEE Main 2021, 17 March Shift 2, Q58] The number of chlorine atoms in 2020 mL of chlorine gas at STP is ______ × 1021\times\,10^{21}. (Round off to the Nearest Integer). [Assume chlorine is an ideal gas at STP, R=0.083R = 0.083 L bar mol−1^{-1} K−1^{-1}, NA=6.023×1023N_A = 6.023\times10^{23}]
Not attempted
Your answer: —
Correct answer: 1
509
[JEE Main 2021, 17 March Shift 1, Q47] With respect to drug-enzyme interaction, identify the wrong statement.
Not attempted
A
Allosteric inhibitor competes with the enzyme's active site
B
Competitive inhibitor binds to the enzyme's active site
C
Non-competitive inhibitor binds to the allosteric site
D
Allosteric inhibitor changes the enzyme's active site
510
[JEE Main 2021, 17 March Shift 1, Q33] Which of the following is the correct structure of tyrosine?
Not attempted
A
(a)
B
(b)
C
(c)
D
(d)
511
[JEE Main 2021, 17 March Shift 1, Q44] Which of the following reactions is an example of ammonolysis?
Not attempted
A
C6H5CH2CN→C6H5CH2CH2NH2C_6H_5CH_2CN \rightarrow C_6H_5CH_2CH_2NH_2
B
C6H5COCl+C6H5NH2→C6H5CONHC6H5C_6H_5COCl + C_6H_5NH_2 \rightarrow C_6H_5CONHC_6H_5
C
C6H5CH2Cl+NH3→C6H5CH2NH2C_6H_5CH_2Cl + NH_3 \rightarrow C_6H_5CH_2NH_2
D
C6H5NH2→C6H5NH3+Cl−C_6H_5NH_2 \rightarrow C_6H_5NH_3^+Cl^-
512
[JEE Main 2021, 17 March Shift 1, Q48] Hoffmann bromamide degradation of benzamide gives product A, which upon heating with CHCl3CHCl_3 and NaOHNaOH gives product B. The structures of A and B are:
Not attempted
A
(a)
A – B –
B
(b)
A – B –
C
(c)
A – B –
D
(d)
A – B –
513
[JEE Main 2021, 17 March Shift 1, Q49] The product "A" in the above reaction is:
Not attempted
Ethylene GlycolH⁺A(Major Product)
A
(a)
B
(b)
C
(c)
D
(d)
514
[JEE Main 2021, 17 March Shift 1, Q40] The reaction given below requires which of the following reaction conditions:
Not attempted
+ NaOH
A
623623 K, 300300 atm
B
573573 K, 300300 atm
C
573573 K, Cu, 300300 atm
D
623623 K, Cu, 300300 atm
515
[JEE Main 2021, 17 March Shift 1, Q32] Given below are two statements: Statement I: Potassium permanganate on heating at 573573 K forms potassium manganate. Statement II: Both potassium permanganate and potassium manganate are tetrahedral and paramagnetic in nature. In the light of the above statements, choose the most appropriate answer from the options given below:
Not attempted
A
Both statement I and statement II are true
B
Both statement I and statement II are false
C
Statement I is true but statement II is false
D
Statement I is false but statement II is true
516
[JEE Main 2021, 17 March Shift 1, Q36] What is the spin-only magnetic moment value (BM) of a divalent metal ion with atomic number 2525, in its aqueous solution?
Not attempted
A
5.925.92
B
5.265.26
C
Zero
D
5.05.0
517
[JEE Main 2021, 17 March Shift 1, Q39] The point of intersection and sudden increase in the slope, in the diagram given below respectively, indicates:
Not attempted
0-100-200-300-400-500-600-700-800-900-1000-1100-12000°C273 K400°C673 K800°C1073 K1200°C1473 K1600°C1873 K2000°C2273 KΔG° / kJ mol⁻¹ of O₂Temperature4Cu + O₂ → 2Cu₂O2Fe + O₂ → 2FeO2CO + O₂ → 2CO₂2Zn + O₂ → 2ZnOC + O₂ → CO₂2C + O₂ → 2CO4/3 Al + O₂ → 2/3 Al₂O₃2Mg + O₂ → 2MgOA
A
ΔG=0\Delta G = 0 and melting or boiling point of the metal oxide.
B
ΔG<0\Delta G < 0 and decomposition of the metal oxide.
C
ΔG=0\Delta G = 0 and reduction of the metal oxide.
D
ΔG>0\Delta G > 0 and decomposition of the metal oxide.
518
[JEE Main 2021, 17 March Shift 1, Q42] A colloidal system consisting of a gas dispersed in a solid is called a/an:
Not attempted
A
Aerosol
B
Solid sol
C
Foam
D
Gel
519
[JEE Main 2021, 17 March Shift 1, Q56] For a certain first order reaction 32%32\% of the reactant is left after 570570 s. The rate constant of this reaction is ______ ×10−3\times10^{-3} s−1^{-1}. (Round off to the Nearest Integer) [Given: log⁡102=0.301\log_{10}2=0.301, ln⁡10=2.303\ln10=2.303]
Not attempted
Your answer: —
Correct answer: 2
520
[JEE Main 2021, 17 March Shift 1, Q41] The correct order of conductivity of ions in water is:
Not attempted
A
Cs+>Rb+>K+>Na+Cs^+>Rb^+>K^+>Na^+
B
K+>Na+>Cs+>Rb+K^+>Na^+>Cs^+>Rb^+
C
Rb+>Na+>K+>Li+Rb^+>Na^+>K^+>Li^+
D
Na+>K+>Rb+>Cs+Na^+>K^+>Rb^+>Cs^+
521
[JEE Main 2021, 17 March Shift 1, Q54] The oxygen dissolved in water exerts a partial pressure of 2020 kPa in the vapour above water. The molar solubility of oxygen in water is ______ ×10−5\times10^{-5} mol dm−3^{-3}. (Round off to the Nearest Integer) [Given: Henry's law constant =KH=8.0×104=K_H=8.0\times10^{4} kPa for O2O_2. Density of water with dissolved oxygen =1.0=1.0 kg dm−3^{-3}]
Not attempted
Your answer: —
Correct answer: 1389
522
[JEE Main 2021, 17 March Shift 1, Q58] The mole fraction of a solute in a 100100 molal aqueous solution is ______ ×10−2\times10^{-2}. (Round off to the Nearest Integer) [Given: Atomic masses: H: 1.01.0 u, O: 16.016.0 u]
Not attempted
Your answer: —
Correct answer: 64
523
[JEE Main 2021, 17 March Shift 1, Q45] Reducing smog is a mixture of:
Not attempted
A
Smoke, fog and N2O3N_2O_3
B
Smoke, fog and O3O_3
C
Smoke, fog and SO2SO_2
D
Smoke, fog and CH2=CH−CHOCH_2=CH-CHO
524
[JEE Main 2021, 17 March Shift 1, Q38] Product "A" in the below chemical reaction is:
Not attempted
HBrCCl₄A(Major Product)
A
(a)
B
(b)
C
(c)
D
(d)
525
[JEE Main 2021, 17 March Shift 1, Q34] Given below are two statements: Statement I: Retardation factor (RfR_f) can be measured in meter/centimetre. Statement II: RfR_f value of a compound remains constant in all solvents. Choose the most appropriate answer from the options given below:
Not attempted
A
Statement I is false but statement II is true
B
Both statement I and statement II are false
C
Both statement I and statement II are true
D
Statement I is true but statement II is false
526
[JEE Main 2021, 17 March Shift 1, Q35] Mesityl oxide is a common name of:
Not attempted
A
3-Methylcyclohexanecarbaldehyde
B
4-Methylpent-3-en-2-one
C
2,4-Dimethylpentan-3-one
D
2-Methylcyclohexanone
527
[JEE Main 2021, 17 March Shift 1, Q46] Which of the following is an aromatic compound?
Not attempted
A
(a)
B
(b)
C
(c)
D
(d)
528
[JEE Main 2021, 17 March Shift 1, Q53] The reaction of white phosphorus on boiling with alkali in an inert atmosphere resulted in the formation of product 'A'. The reaction of 11 mol of 'A' with an excess of AgNO3AgNO_3 in an aqueous medium gives ______ mol(s) of Ag. (Round off to the Nearest Integer)
Not attempted
Your answer: —
Correct answer: 4
529
[JEE Main 2021, 17 March Shift 1, Q31] The INCORRECT statement(s) about heavy water is (are) (A) Used as a moderator in a nuclear reactor (B) Obtained as a by-product in the fertilizer industry (C) Used for the study of the reaction mechanism (D) Has a higher dielectric constant than water Choose the correct answer from the option given below:
Not attempted
A
(B) only
B
(B) and (D) only
C
(C) only
D
(D) only
530
[JEE Main 2021, 17 March Shift 1, Q52] 1515 mL of an aqueous solution of Fe2+Fe^{2+} in the acidic medium completely reacted with 2020 mL of 0.030.03 M aqueous Cr2O72−Cr_2O_7^{2-}. The molarity of the Fe2+Fe^{2+} solution is ______ ×10−2\times 10^{-2} M. (Round off to the Nearest Integer)
Not attempted
Your answer: —
Correct answer: 24
531
[JEE Main 2021, 17 March Shift 1, Q60] 0.010.01 moles of a weak acid HAHA (Ka=2.0×10−6K_a=2.0\times10^{-6}) is dissolved in 1.01.0 L of 0.10.1 M HClHCl solution. The degree of dissociation of HAHA is ______ ×10−5\times10^{-5}. (Round off to the Nearest Integer) Assume degree of dissociation ≪1\ll1.
Not attempted
Your answer: —
Correct answer: 2
532
[JEE Main 2021, 17 March Shift 1, Q55] The standard enthalpies of formation of Al2O3Al_2O_3 and CaOCaO are −1675-1675 kJ mol−1^{-1} and −635-635 kJ mol−1^{-1} respectively. For the reaction 3CaO+2Al→3Ca+Al2O33CaO+2Al\rightarrow3Ca+Al_2O_3 the standard reaction enthalpy ΔrH∘=\Delta_rH^\circ= ______ kJ. (Round off to the Nearest Integer)
Not attempted
Your answer: —
Correct answer: 230
533
[JEE Main 2021, 17 March Shift 1, Q57] The pressure exerted by a non-reactive gaseous mixture of 6.46.4 g of methane and 8.88.8 g of carbon dioxide in a 1010 L vessel at 27∘27^\circC is ______ kPa. (Round off to the Nearest Integer) [Assume gases are ideal, R=8.314R=8.314 J mol−1^{-1} K−1^{-1}. Atomic masses: C: 12.012.0 u, H: 1.01.0 u, O: 16.016.0 u]
Not attempted
Your answer: —
Correct answer: 150
534
[JEE Main 2021, 17 March Shift 1, Q37] A central atom in a molecule has two lone pairs of electrons and forms three single bonds. The shape of this molecule is:
Not attempted
A
Trigonal pyramidal
B
T-shaped
C
See-saw
D
Planar triangular
535
[JEE Main 2021, 17 March Shift 1, Q50] Which of the following compounds CANNOT act as a Lewis base?
Not attempted
A
ClF3ClF_3
B
PCl5PCl_5
C
NF3NF_3
D
SF4SF_4
536
[JEE Main 2021, 17 March Shift 1, Q43] The absolute value of the electron gain enthalpy of halogens satisfies:
Not attempted
A
I>Br>Cl>FI>Br>Cl>F
B
F>Cl>Br>IF>Cl>Br>I
C
Cl>F>Br>ICl>F>Br>I
D
Cl>Br>F>ICl>Br>F>I
537
[JEE Main 2021, 17 March Shift 1, Q51] A certain orbital has n=4n=4 and ml=−3m_l=-3. The number of radial nodes in this orbital is ______. (Round off to the Nearest Integer)
Not attempted
Your answer: —
Correct answer: 0
538
[JEE Main 2021, 17 March Shift 1, Q59] In the above reaction, 3.93.9 g of benzene on nitration gives 4.924.92 g of nitrobenzene. The percentage yield of nitrobenzene in the above reaction is ______ %. (Round off to the Nearest Integer) (Given atomic mass: C: 12.012.0 u, H: 1.01.0 u, O: 16.016.0 u, N: 14.014.0 u)
Not attempted
HNO₃H₂SO₄
Your answer: —
Correct answer: 80
539
[JEE Main 2021, 16 March Shift 2, Q42] Which of the following polymer is used in the manufacture of wood laminates?
Not attempted
A
Melamine formaldehyde resin
B
cis-poly isoprene
C
Phenol and formaldehyde resin
D
Urea formaldehyde resin
540
[JEE Main 2021, 16 March Shift 2, Q39] The secondary structure of protein is stabilised by:
Not attempted
A
glycosidic bond
B
Hydrogen bonding
C
Peptide bond
D
Van der Waals forces
541
[JEE Main 2021, 16 March Shift 2, Q46] Ammonolysis of Alkyl halides followed by the treatment with NaOH solution can be used to prepare primary, secondary and tertiary amines. The purpose of NaOH in the reaction is:
Not attempted
A
to increase the reactivity of alkyl halide
B
to remove basic impurities
C
to activate NH3NH_3 used in the reaction
D
to remove acidic impurities
542
[JEE Main 2021, 16 March Shift 2, Q48] Which of the following is least basic?
Not attempted
A
(CH3CO)2NH(CH_3CO)_2NH
B
(CH3CO)NHC2H5(CH_3CO)NHC_2H_5
C
(C2H5)3N(C_2H_5)_3N
D
(C2H5)2NH(C_2H_5)_2NH
543
[JEE Main 2021, 16 March Shift 2, Q34] The structure of XX is:
Not attempted
CNOCH3(ii) H3O+(1.0 equivalent)(i) C6H5MgBr, dry etherXMajor product
A
Diaryl ketone, with the −CH(CH3)C6H5-CH(CH_3)C_6H_5 side chain
OC6H5C6H5
B
Primary amine, with the −CH(CH3)C6H5-CH(CH_3)C_6H_5 side chain
NH2C6H5
C
Primary amine, with the −CH(CH3)OCH3-CH(CH_3)OCH_3 side chain
NH2OCH3
D
Aryl phenyl ketone, with the −CH(CH3)OCH3-CH(CH_3)OCH_3 side chain
OC6H5OCH3
544
[JEE Main 2021, 16 March Shift 2, Q52] [Ti(H2O)6]3+[Ti(H_2O)_6]^{3+} absorbs light of wavelength 498498 nm during a d-d transition. The octahedral splitting energy for the above complex is ______ ×10−19\times10^{-19} J. (Round off to the Nearest Integer). h=6.626×10−34h=6.626\times10^{-34} Js; c=3×108c=3\times10^8 m s−1^{-1}.
Not attempted
Your answer: —
Correct answer: 4
545
[JEE Main 2021, 16 March Shift 2, Q44] FeX2FeX_2 and FeY3FeY_3 are known when XX and YY are:
Not attempted
A
X=F, Cl, Br, IX=F,\ Cl,\ Br,\ I and Y=F, Cl, Br, IY=F,\ Cl,\ Br,\ I
B
X=F, Cl, Br, IX=F,\ Cl,\ Br,\ I and Y=F, Cl, BrY=F,\ Cl,\ Br
C
X=F, Cl, BrX=F,\ Cl,\ Br and Y=F, Cl, Br, IY=F,\ Cl,\ Br,\ I
D
X=Cl, Br, IX=Cl,\ Br,\ I and Y=F, Cl, Br, IY=F,\ Cl,\ Br,\ I
546
[JEE Main 2021, 16 March Shift 2, Q49] Arrange the following metal complex/compounds in the increasing order of spin only magnetic moment. Presume all the three, high spin system. (Atomic numbers Ce=58Ce=58, Gd=64Gd=64 and Eu=63Eu=63.) (a) (NH4)2[Ce(NO3)6](NH_4)_2[Ce(NO_3)_6] (b) Gd(NO3)3Gd(NO_3)_3 (c) Eu(NO3)3Eu(NO_3)_3
Not attempted
A
(b) < (a) < (c)
B
(a) < (c) < (b)
C
(c) < (a) < (b)
D
(a) < (b) < (c)
547
[JEE Main 2021, 16 March Shift 2, Q40] Which of the following reduction reaction CANNOT be carried out with coke?
Not attempted
A
Cu2O→CuCu_2O\rightarrow Cu
B
Fe2O3→FeFe_2O_3\rightarrow Fe
C
Al2O3→AlAl_2O_3\rightarrow Al
D
ZnO→ZnZnO\rightarrow Zn
548
[JEE Main 2021, 16 March Shift 2, Q47] The INCORRECT statements below regarding colloidal solutions is:
Not attempted
A
A colloidal solution shows colligative properties.
B
An ordinary filter paper can stop the flow of colloidal particles.
C
The flocculating power of Al3+Al^{3+} is more than that of Na+Na^+
D
A colloidal solution shows Brownian motion of colloidal particles.
549
[JEE Main 2021, 16 March Shift 2, Q51] AA and BB decompose via first order kinetics with half-lives 54.054.0 min and 18.018.0 min respectively. Starting from an equimolar non reactive mixture of AA and BB, the time taken for the concentration of AA to become 1616 times that of BB is ______ min. (Round off to the Nearest Integer).
Not attempted
Your answer: —
Correct answer: 108
550
[JEE Main 2021, 16 March Shift 2, Q54] A 5.05.0 mmol dm−3^{-3} aqueous solution of KCl has a conductance of 0.550.55 mS when measured in a cell of cell constant 1.31.3 cm−1^{-1}. The molar conductivity of this solution is ______ mS m2^2 mol−1^{-1}. (Round off to the Nearest Integer).
Not attempted
Your answer: —
Correct answer: 14
551
[JEE Main 2021, 16 March Shift 2, Q59] At 363363 K, the vapor pressure of AA is 2121 kPa and that of BB is 1818 kPa. One mole of AA and 22 moles of BB are mixed. Assuming that this solution is ideal, the vapor pressure of the mixture is ______ kPa. (Round off to the Nearest Integer).
Not attempted
Your answer: —
Correct answer: 19
552
[JEE Main 2021, 16 March Shift 2, Q58] Ga (atomic mass 7070 u) crystallizes in a hexagonal close packed structure. The total number of voids in 0.5810.581 g of Ga is ______ ×1021\times10^{21}. (Round off to the Nearest Integer). [Given: NA=6.023×1023N_A=6.023\times10^{23}]
Not attempted
Your answer: —
Correct answer: 15
553
[JEE Main 2021, 16 March Shift 2, Q45] The green house gas/es is (are): (A) Carbon dioxide (B) Oxygen (C) Water vapour (D) Methane Choose the most appropriate answer from the options given below:
Not attempted
A
(A) and (C) only
B
(A) and (B) only
C
(A), (C) and (D) only
D
(A) only
554
[JEE Main 2021, 16 March Shift 2, Q31] An unsaturated hydrocarbon XX on ozonolysis gives AA. Compound AA when warmed with ammoniacal silver nitrate forms a bright silver mirror along the sides of the test tube. The unsaturated hydrocarbon XX is:
Not attempted
A
(CH3)2C=C(CH3)2(CH_3)_2C=C(CH_3)_2 (2,3-dimethylbut-2-ene)
CH3CH3CH3CH3
B
HC≡C−CH2−CH3HC\equiv C-CH_2-CH_3
C
CH3−C≡C−CH3CH_3-C\equiv C-CH_3
D
(CH3)2C=(CH_3)_2C= cyclopropylidene (isopropylidenecyclopropane)
CH3CH3
555
[JEE Main 2021, 16 March Shift 2, Q36] Identify the reagent(s) AA and condition(s) for the reaction. (Cyclohexene reacts with AA to give 3,6-dichlorocyclohexene, the ring having a double bond and one chlorine on each of the two allylic carbons that are para to each other.)
Not attempted
AClCl
A
A=HClA=HCl; Anhydrous AlCl3AlCl_3
B
A=HClA=HCl, ZnCl2ZnCl_2
C
A=Cl2A=Cl_2; dark, Anhydrous AlCl3AlCl_3
D
A=Cl2A=Cl_2; UV light
556
[JEE Main 2021, 16 March Shift 2, Q43] In the above reaction, the reagent "A" is: (3-methylanisole is converted to 3-methoxybenzoic acid.)
Not attempted
CH3OCH3"A"COOHOCH3
A
NaBH4, H3O+NaBH_4,\ H_3O^+
B
Alkaline KMnO4, H+KMnO_4,\ H^+
C
HCl, Zn−HgHCl,\ Zn-Hg
D
LiAlH4LiAlH_4
557
[JEE Main 2021, 16 March Shift 2, Q32] Match List-I with List-II: List-I (Test/Reagents/Observation(s))List-II (Species detected)(a) Lassaigne’s test(i) Carbon(b) Cu(II) oxide(ii) Sulphur(c) Silver nitrate(iii) N, S, P and halogen(d) The sodium fusion extract gives black precipitate with acetic acid and lead acetate(iv) Halogen specifically\displaystyle\begin{array}{ll}\textbf{List-I (Test/Reagents/Observation(s))} & \textbf{List-II (Species detected)} \\ \text{(a) Lassaigne's test} & \text{(i) Carbon} \\ \text{(b) Cu(II) oxide} & \text{(ii) Sulphur} \\ \text{(c) Silver nitrate} & \text{(iii) N, S, P and halogen} \\ \text{(d) The sodium fusion extract gives black precipitate with acetic acid and lead acetate} & \text{(iv) Halogen specifically} \end{array} The correct match is:
Not attempted
A
(a)-(iii), (b)-(i), (c)-(ii), (d)-(iv)
B
(a)-(iii), (b)-(i), (c)-(iv), (d)-(ii)
C
(a)-(i), (b)-(iv), (c)-(iii), (d)-(ii)
D
(a)-(i), (b)-(ii), (c)-(iv), (d)-(iii)
558
[JEE Main 2021, 16 March Shift 2, Q57] In Duma's method of estimation of nitrogen, 0.18400.1840 g of an organic compound gave 3030 mL of nitrogen collected at 287287 K and 758758 mm of Hg pressure. The percentage composition of nitrogen in the compound is ______. (Round off to the Nearest Integer). [Given: Aqueous tension at 287287 K =14=14 mm of Hg]
Not attempted
Your answer: —
Correct answer: 19
559
[JEE Main 2021, 16 March Shift 2, Q37] The INCORRECT statement regarding the structure of C60C_{60} is:
Not attempted
A
The six-membered rings are fused to both six and five-membered rings.
B
The five-membered rings are fused only to six-membered rings.
C
It contains 1212 six-membered rings and 2424 five-membered rings.
D
Each carbon atom forms three sigma bonds.
560
[JEE Main 2021, 16 March Shift 2, Q41] The exact volumes of 11 M NaOH solution required to neutralise 5050 mL of 11 M H3PO3H_3PO_3 solution and 100100 mL of 22 M H3PO2H_3PO_2 solution, respectively, are:
Not attempted
A
100100 mL and 5050 mL
B
5050 mL and 5050 mL
C
100100 mL and 200200 mL
D
100100 mL and 100100 mL
561
[JEE Main 2021, 16 March Shift 2, Q33] Statement I: Sodium hydride can be used as an oxidising agent. Statement II: The lone pair of electrons on nitrogen in pyridine makes it basic. Choose the correct answer from the options given below:
Not attempted
A
Statement I is true but statement II is false
B
Both statement I and statement II are false
C
Statement I is false but statement II is true
D
Both statement I and statement II are true
562
[JEE Main 2021, 16 March Shift 2, Q50] The correct statements about H2O2H_2O_2 are: (A) used in the treatment of effluents. (B) used as both oxidising and reducing agents. (C) the two hydroxyl groups lie in the same plane. (D) miscible with water. Choose the correct answer from the options given below:
Not attempted
A
(A), (B) and (D) only
B
(A), (B), (C) and (D)
C
(B), (C) and (D) only
D
(A), (C) and (D) only
563
[JEE Main 2021, 16 March Shift 2, Q53] Sulphurous acid (H2SO3H_2SO_3) has Ka1=1.7×10−2K_{a1}=1.7\times10^{-2} and Ka2=6.4×10−8K_{a2}=6.4\times10^{-8}. The pH of 0.5880.588 M H2SO3H_2SO_3 is ______. (Round off to the Nearest Integer).
Not attempted
Your answer: —
Correct answer: 1
564
[JEE Main 2021, 16 March Shift 2, Q60] At 25∘C25^\circ C, 5050 g of iron reacts with HCl to form FeCl2FeCl_2. The evolved hydrogen gas expands against a constant pressure of 11 bar. The work done by the gas during this expansion is ______ J. (Round off to the Nearest Integer). [Given: R=8.314R=8.314 J mol−1^{-1} K−1^{-1}. Assume, hydrogen is an ideal gas] [Atomic mass of Fe is 55.8555.85 u]
Not attempted
Your answer: —
Correct answer: 2218
565
[JEE Main 2021, 16 March Shift 2, Q35] The characteristics of elements XX, YY and ZZ with atomic numbers, respectively, 3333, 5353 and 8383 are:
Not attempted
A
XX and YY are metalloids and ZZ is a metal
B
XX, YY and ZZ are metals
C
XX and ZZ are non-metals and YY is a metalloid
D
XX is a metalloid, YY is a non-metal and ZZ is a metal
566
[JEE Main 2021, 16 March Shift 2, Q38] Identify the elements XX and YY using the ionisation energy values given below: 1st (kJ/mol)2nd (kJ/mol)X4954563Y7311450\displaystyle\begin{array}{|c|c|c|} \hline & \text{1st (kJ/mol)} & \text{2nd (kJ/mol)} \\ \hline X & 495 & 4563 \\ \hline Y & 731 & 1450 \\ \hline \end{array}
Not attempted
A
X=FX=F; Y=MgY=Mg
B
X=MgX=Mg; Y=FY=F
C
X=MgX=Mg; Y=NaY=Na
D
X=NaX=Na; Y=MgY=Mg
567
[JEE Main 2021, 16 March Shift 2, Q55] The number of orbitals with n=5n=5, ml=+2m_l=+2 is ______. (Round off to the Nearest Integer).
Not attempted
Your answer: —
Correct answer: 3
568
[JEE Main 2021, 16 March Shift 2, Q56] When 3535 mL of 0.150.15 M lead nitrate solution is mixed with 2020 mL of 0.120.12 M chromic sulphate solution, ______ ×10−5\times10^{-5} moles of lead sulphate precipitate out. (Round off to the Nearest Integer).
Not attempted
Your answer: —
Correct answer: 525
569
[JEE Main 2021, 16 March Shift 1, Q50] The functions of antihistamine are:
Not attempted
A
Antiallergic and Analgesic
B
Antacid and antiallergic
C
Antiallergic and antidepressant
D
Analgesic and antacid
570
[JEE Main 2021, 16 March Shift 1, Q35] Which among the following pairs of Vitamins is stored in our body relatively for longer duration?
Not attempted
A
Ascorbic acid and Vitamin D
B
Thiamine and Ascorbic acid
C
Vitamin A and Vitamin D
D
Thiamine and Vitamin A
571
[JEE Main 2021, 16 March Shift 1, Q36] In the above chemical reaction, intermediate "X" and reagent/condition "A" are:
Not attempted
NH2273 - 278 KNaNO2, HClXAOH
A
X=C6H5N2+Cl−X=C_6H_5N_2^{+}Cl^{-} (benzenediazonium chloride); A=H2O/NaOHA=H_2O/NaOH
B
X=C6H5NO2X=C_6H_5NO_2 (nitrobenzene); A=H2O/NaOHA=H_2O/NaOH
C
X=C6H5N2+Cl−X=C_6H_5N_2^{+}Cl^{-} (benzenediazonium chloride); A=H2O/HeatA=H_2O/\text{Heat}
D
X=C6H5NO2X=C_6H_5NO_2 (nitrobenzene); A=H2O/HeatA=H_2O/\text{Heat}
572
[JEE Main 2021, 16 March Shift 1, Q37] Which of the following reaction DOES NOT involve Hoffmann bromamide degradation?
Not attempted
A
C6H5CH2CONH2→Br2, NaOHC6H5CH2NH2C_6H_5CH_2CONH_2\xrightarrow{Br_2,\ NaOH}C_6H_5CH_2NH_2
ONH2Br2, NaOHNH2
B
C6H5CN→(i) KOH, H2O (ii) Br2, NaOHC6H5NH2C_6H_5CN\xrightarrow{(i)\ KOH,\ H_2O\ (ii)\ Br_2,\ NaOH}C_6H_5NH_2
CN(ii) Br2, NaOH(i) KOH, H2ONH2
C
C6H5COCl→(i) NH3, NaOH (ii) Br2, NaOHC6H5NH2C_6H_5COCl\xrightarrow{(i)\ NH_3,\ NaOH\ (ii)\ Br_2,\ NaOH}C_6H_5NH_2
OCl(ii) Br2, NaOH(i) NH3, NaOHNH2
D
C6H5CH2COCH3→(i) Br2, NaOH/H+ (ii) NH3/heat (iii) LiAlH4/H2OC6H5CH2CH2NH2C_6H_5CH_2COCH_3\xrightarrow{(i)\ Br_2,\ NaOH/H^+\ (ii)\ NH_3/\text{heat}\ (iii)\ LiAlH_4/H_2O}C_6H_5CH_2CH_2NH_2
OCH3(iii) LiAlH4/H2O(ii) NH3/heat(i) Br2, NaOH/H+NH2
573
[JEE Main 2021, 16 March Shift 1, Q42] The product "P" in the above reaction is:
Not attempted
OO(ii) H3O+(i) DIBAL-H, Toluene, -78 °C"P"(Major Product)
A
22-methyl-1,21,2-dihydronaphthalen-11-yl formate (formate ester)
OOH
B
22-(1,21,2-dihydronaphthalen-22-yl)acetaldehyde
CHO
C
22-(1,21,2-dihydronaphthalen-22-yl)acetic acid
COOH
D
22-(11-hydroxy-1,21,2-dihydronaphthalen-22-yl)acetaldehyde
OHCHO
574
[JEE Main 2021, 16 March Shift 1, Q46] Assertion A: Enol form of acetone [CH3COCH3CH_3COCH_3] exists in <0.1%<0.1\% quantity. However, the enol form of acetyl acetone [CH3COCH2COCH3CH_3COCH_2COCH_3] exists in approximately 15%15\% quantity. Reason R: Enol form of acetyl acetone is stabilized by intramolecular hydrogen bonding, which is not possible in enol form of acetone. Choose the correct statement:
Not attempted
A
A is true but R is false
B
Both A and R are true but R is the correct explanation of A
C
A is false but R is true
D
Both A and R are true but R is not the correct explanation of A
575
[JEE Main 2021, 16 March Shift 1, Q40] The products "A" and "B" formed in above reactions are:
Not attempted
H3COH358 K20% H3PO4"A"Major productH3CCl(CH3)3CO- K+"B"Major product
A
AA: 1-methylcyclohexene; BB: methylenecyclohexane
A -B -CH2CH3
B
AA: methylenecyclohexane; BB: 1-methylcyclohexene
A -B -CH2CH3
C
AA: methylenecyclohexane; BB: methylenecyclohexane
A -B -CH2CH2
D
AA: 1-methylcyclohexene; BB: 1-methylcyclohexene
A -B -CH3CH3
576
[JEE Main 2021, 16 March Shift 1, Q55] The equivalents of ethylene diamine required to replace the neutral ligands from the coordination sphere of the trans-complex of CoCl3⋅4NH3CoCl_3\cdot4NH_3 is ______. (Round off to the nearest Integer).
Not attempted
Your answer: —
Correct answer: 2
577
[JEE Main 2021, 16 March Shift 1, Q39] Given below are two statement: One is labelled as Assertion A and the other is labelled as Reason R: Assertion A: Size of Bk3+Bk^{3+} ion is less than Np3+Np^{3+} ion. Reason R: The above is a consequence of the lanthanoid contraction. In the light of the above statements, choose the correct answer from the options given below:
Not attempted
A
A is false but R is true
B
Both A and R are true but R is not the correct explanation of A
C
A is true but R is false
D
Both A and R are true and R is the correct explanation of A
578
[JEE Main 2021, 16 March Shift 1, Q44] Given below are two statements: Statement I: The E∘E^\circ value for Ce4+/Ce3+Ce^{4+}/Ce^{3+} is +1.74+1.74 V. Statement II: Ce is more stable in Ce4+Ce^{4+} state than Ce3+Ce^{3+} state. In the light of the above statements, choose the correct answer from the options given below:
Not attempted
A
Both Statement I and Statement II are correct
B
Statement I is incorrect but statement II is correct
C
Both Statement I and Statement II are incorrect
D
Statement I is correct but statement II is incorrect
579
[JEE Main 2021, 16 March Shift 1, Q43] Match List - I with List - II: List-I (Industrial process)List-II (Application)(a) Haber’s process(i) HNO3 synthesis(b) Ostwald’s process(ii) Aluminium extraction(c) Contact process(iii) NH3 synthesis(d) Hall-Heroult process(iv) H2SO4 synthesis\displaystyle\begin{array}{|l|l|} \hline \textbf{List-I (Industrial process)} & \textbf{List-II (Application)} \\ \hline \text{(a) Haber's process} & \text{(i) } HNO_3 \text{ synthesis} \\ \text{(b) Ostwald's process} & \text{(ii) Aluminium extraction} \\ \text{(c) Contact process} & \text{(iii) } NH_3 \text{ synthesis} \\ \text{(d) Hall-Heroult process} & \text{(iv) } H_2SO_4 \text{ synthesis} \\ \hline \end{array} Choose the correct answer from the options given below:
Not attempted
A
(a)-(iv), (b)-(i), (c)-(ii), (d)-(iii)
B
(a)-(ii), (b)-(iii), (c)-(iv), (d)-(i)
C
(a)-(iii), (b)-(iv), (c)-(i), (d)-(ii)
D
(a)-(iii), (b)-(i), (c)-(iv), (d)-(ii)
580
[JEE Main 2021, 16 March Shift 1, Q49] The process that involves the removal of sulphur from the ores is:
Not attempted
A
Refining
B
Roasting
C
Smelting
D
Leaching
581
[JEE Main 2021, 16 March Shift 1, Q60] The decomposition of formic acid on gold surface follows first order kinetics. If the rate constant at 300300 K is 1.0×10−31.0\times10^{-3} s−1^{-1} and the activation energy Ea=11.488E_a=11.488 kJ mol−1^{-1}, the rate constant at 200200 K is ______ ×10−5\times10^{-5} s−1^{-1}. (Round off to the Nearest Integer). (Given: R=8.314R=8.314 J mol−1^{-1} K−1^{-1})
Not attempted
Your answer: —
Correct answer: 10
582
[JEE Main 2021, 16 March Shift 1, Q53] AB2AB_2 is 10%10\% dissociated in water to A2+A^{2+} and B−B^-. The boiling point of a 10.010.0 molal aqueous solution of AB2AB_2 is ______ ∘C^\circ C. (Round off to the Nearest Integer). [Given: Molal elevation constant of water Kb=0.5K_b=0.5 K kg mol−1^{-1}, boiling point of pure water =100∘C=100^\circ C]
Not attempted
Your answer: —
Correct answer: 106
583
[JEE Main 2021, 16 March Shift 1, Q58] A 6.506.50 molal solution of KOH (aq.) has a density of 1.891.89 g cm−3^{-3}. The molarity of the solution is ______ mol dm−3^{-3}. (Round off to the Nearest Integer). [Atomic masses: K: 39.039.0 u; O: 16.016.0 u; H: 1.01.0 u]
Not attempted
Your answer: —
Correct answer: 9
584
[JEE Main 2021, 16 March Shift 1, Q54] A certain element crystallizes in a bcc lattice of unit cell edge length 2727 Å. If the same element under the same conditions crystallises in the fcc lattice, the edge length of the unit cell in Å will be ______. (Round off to the Nearest Integer). [Assume each lattice point has a single atom] [Assume 3=1.73\sqrt{3}=1.73, 2=1.41\sqrt{2}=1.41]
Not attempted
Your answer: —
Correct answer: 33
585
[JEE Main 2021, 16 March Shift 1, Q41] The type of pollution that gets increased during the day time and in the presence of O3O_3 is:
Not attempted
A
Global warming
B
Reducing smog
C
Acid rain
D
Oxidizing smog
586
[JEE Main 2021, 16 March Shift 1, Q31] Among the following, the aromatic compounds are:
Not attempted
CH2ABCD
A
(A) and (B) only
B
(A), (B) and (C) only
C
(B), (C) and (D) only
D
(B) and (C) only
587
[JEE Main 2021, 16 March Shift 1, Q33] Which of the following is Lindlar catalyst?
Not attempted
A
Zinc chloride and HCl
B
Partially deactivated palladised charcoal
C
Sodium and Liquid NH3NH_3
D
Cold dilute solution of KMnO4KMnO_4
588
[JEE Main 2021, 16 March Shift 1, Q34] In chromatography technique, the purification of compound is independent of:
Not attempted
A
Length of the column or TLC plate
B
Mobility or flow of solvent system
C
Physical state of the pure compound
D
Solubility of the compound
589
[JEE Main 2021, 16 March Shift 1, Q52] Complete combustion of 750750 g of an organic compound provides 420420 g of CO2CO_2 and 210210 g of H2OH_2O. The percentage composition of carbon and hydrogen in organic compound is 15.315.3 and ______ respectively. (Round off to the Nearest Integer).
Not attempted
Your answer: —
Correct answer: 3
590
[JEE Main 2021, 16 March Shift 1, Q38] A group 15 element, which is a metal and forms a hydride with strongest reducing power among group 15 hydrides. The element is:
Not attempted
A
Bi
B
As
C
P
D
Sb
591
[JEE Main 2021, 16 March Shift 1, Q48] Match List - I with List - II: List-I (Name of oxo acid)List-II (Oxidation state of P)(a) Hypophosphorous acid(i) +5(b) Orthophosphoric acid(ii) +4(c) Hypophosphoric acid(iii) +3(d) Orthophosphorous acid(iv) +2(v) +1\displaystyle\begin{array}{|l|l|} \hline \textbf{List-I (Name of oxo acid)} & \textbf{List-II (Oxidation state of P)} \\ \hline \text{(a) Hypophosphorous acid} & \text{(i) } +5 \\ \text{(b) Orthophosphoric acid} & \text{(ii) } +4 \\ \text{(c) Hypophosphoric acid} & \text{(iii) } +3 \\ \text{(d) Orthophosphorous acid} & \text{(iv) } +2 \\ & \text{(v) } +1 \\ \hline \end{array} Choose the correct answer from the options given below:
Not attempted
A
(a)-(iv), (b)-(v), (c)-(ii), (d)-(iii)
B
(a)-(v), (b)-(iv), (c)-(ii), (d)-(iii)
C
(a)-(v), (b)-(i), (c)-(ii), (d)-(iii)
D
(a)-(iv), (b)-(i), (c)-(ii), (d)-(iii)
592
[JEE Main 2021, 16 March Shift 1, Q45] Given below are two statements: Statement I: Both CaCl2⋅6H2OCaCl_2\cdot6H_2O and MgCl2⋅8H2OMgCl_2\cdot8H_2O undergo dehydration on heating. Statement II: BeOBeO is amphoteric whereas the oxides of other elements in the same group are acidic. In the light of the above statements, choose the correct answer from the options given below:
Not attempted
A
Statement I is true but statement II is false
B
Both Statement I and Statement II are false
C
Statement I is false but statement II is true
D
Both Statement I and Statement II are true
593
[JEE Main 2021, 16 March Shift 1, Q32] Given below are two statements: Statement I: H2O2H_2O_2 can act as both oxidizing and reducing agent in basic medium. Statement II: In the hydrogen economy, the energy is transmitted in the form of dihydrogen. In the light of the above statements, choose the correct answer from the options given below:
Not attempted
A
Statement I is false but statement II is true
B
Both Statement I and Statement II are true
C
Statement I is true but statement II is false
D
Both Statement I and Statement II are false
594
[JEE Main 2021, 16 March Shift 1, Q51] 2MnO4−+bC2O42−+cH+→xMn2++yCO2+zH2O2MnO_4^- + bC_2O_4^{2-} + cH^+ \rightarrow xMn^{2+} + yCO_2 + zH_2O If the above equation is balanced with integer coefficients, the value of cc is ______. (Round off to the nearest integer)
Not attempted
Your answer: —
Correct answer: 16
595
[JEE Main 2021, 16 March Shift 1, Q56] For the reaction A(g)⇌B(g)A(g)\rightleftharpoons B(g) at 495495 K, ΔrG∘=−9.478\Delta_rG^\circ=-9.478 kJ mol−1^{-1}. If we start the reaction in a closed container at 495495 K with 2222 millimoles of AA, the amount of BB in the equilibrium mixture is ______ millimoles. (Round off to the nearest Integer). [R=8.314R=8.314 J mol−1^{-1} K−1^{-1}; ln⁡10=2.303\ln10=2.303]
Not attempted
Your answer: —
Correct answer: 20
596
[JEE Main 2021, 16 March Shift 1, Q59] Two salts A2XA_2X and MXMX have the same value of solubility product of 4.0×10−124.0\times10^{-12}. The ratio of their molar solubilities i.e. S(A2X)S(MX)=\dfrac{S(A_2X)}{S(MX)}= ______. (Round off to the Nearest Integer).
Not attempted
Your answer: —
Correct answer: 50
597
[JEE Main 2021, 16 March Shift 1, Q47] Given below are two statements: One is labelled as Assertion A and the other is labelled as Reason R Assertion A: The H-O-H bond angle in water molecule is 104.5∘104.5^\circ. Reason R: The lone pair - lone pair repulsion of electrons is higher than the bond pair-bond pair repulsion. In the light of the above statements, choose the correct answer from the options given below:
Not attempted
A
A is false but R is true
B
A is true but R is false
C
Both A and R are true, and R is the correct explanation of A
D
Both A and R are true, but R is not the correct explanation of A
598
[JEE Main 2021, 16 March Shift 1, Q57] When light of wavelength 248248 nm falls on a metal of threshold energy 3.03.0 eV, the de-Broglie wavelength of emitted electrons is ______ Å. (Round off to the Nearest Integer). [Use: 3=1.73\sqrt{3}=1.73, h=6.63×10−34h=6.63\times10^{-34} Js, me=9.1×10−31m_e=9.1\times10^{-31} kg, c=3.0×108c=3.0\times10^{8} m s−1^{-1}, 11 eV =1.6×10−19=1.6\times10^{-19} J]
Not attempted
Your answer: —
Correct answer: 9
599
[JEE Main 2021, 26 February Shift 2, Q31] Match List-I with List-II: List-IList-IIA. Sucrose(i) β-D-Galactose and β-D-GlucoseB. Lactose(ii) α-D-Glucose and β-D-FructoseC. Maltose(iii) α-D-Glucose and α-D-Glucose\displaystyle\begin{array}{|l|l|} \hline \textbf{List-I} & \textbf{List-II} \\ \hline \text{A. Sucrose} & \text{(i) } \beta\text{-D-Galactose and } \beta\text{-D-Glucose} \\ \text{B. Lactose} & \text{(ii) } \alpha\text{-D-Glucose and } \beta\text{-D-Fructose} \\ \text{C. Maltose} & \text{(iii) } \alpha\text{-D-Glucose and } \alpha\text{-D-Glucose} \\ \hline \end{array}
Not attempted
A
A - (iii), B - (i), C - (ii)
B
A - (i), B - (iii), C - (ii)
C
A - (iii), B - (ii), C - (i)
D
A - (ii), B - (i), C - (iii)
600
[JEE Main 2021, 26 February Shift 2, Q33] Seliwanoff test and Xanthoproteic test are used for the identification of _______ and _______ respectively.
Not attempted
A
Ketoses, aldoses
B
Proteins, ketoses
C
Aldoses, ketoses
D
Ketoses, proteins
601
[JEE Main 2021, 26 February Shift 2, Q47] A. Phenyl methanamine B. N,N-Dimethylaniline C. N-Methyl aniline D. Benzenamine Choose the correct order of basic nature of the above amines.
Not attempted
A
D > B > C > A
B
A > C > B > D
C
A > B > C > D
D
D > C > B > A
602
[JEE Main 2021, 26 February Shift 2, Q35] Identify A in the given chemical reaction. NaOH, C2H5OH, H2O, ΔNaOH,\ C_2H_5OH,\ H_2O,\ \Delta is used with the compound shown, giving A (major product).
Not attempted
CHOCHO
A
Option (A): see figure
COOHOH
B
Option (B): see figure
CHO
C
Option (C): see figure
OO
D
Option (D): see figure
CHO
603
[JEE Main 2021, 26 February Shift 2, Q40] 2, 4-DNP test can be used to identify
Not attempted
A
Amine
B
Aldehyde
C
Ether
D
Halogens
604
[JEE Main 2021, 26 February Shift 2, Q39] Identify A in the following chemical reaction. Starting material: 4-methoxybenzaldehyde. Reagents: (i) HCHOHCHO, NaOHNaOH; (ii) CH3CH2BrCH_3CH_2Br, NaHNaH, DMFDMF; (iii) HIHI, Δ\Delta.
Not attempted
CHOOCH₃
A
Option (A): see figure
COOCH₂CH₃HO
B
Option (B): see figure
CH₂IHO
C
Option (C): see figure
CH₂OHOCH₃
D
Option (D): see figure
CH₂OHHO
605
[JEE Main 2021, 26 February Shift 2, Q42] Ceric ammonium nitrate and CHCl3CHCl_3/alc. KOH are used for the identification of functional groups present in _______ and _______ respectively.
Not attempted
A
Alcohol, amine
B
Amine, phenol
C
Alcohol, phenol
D
Amine, alcohol
606
[JEE Main 2021, 26 February Shift 2, Q43] Identify A in the given reaction. The compound shown is treated with SOCl2SOCl_2 to give A (major product).
Not attempted
OHCH₂OHHO
A
Option (A): see figure
ClCH₂OHOH
B
Option (B): see figure
OHCH₂ClOH
C
Option (C): see figure
OHCH₂ClCl
D
Option (D): see figure
ClCH₂ClCl
607
[JEE Main 2021, 26 February Shift 2, Q49] Match List-I with List-II List-IList-IIA. C6H5N2+Cl−→Cu2Cl2C6H5Cl+N2(i) Wurtz reactionB. C6H5N2+Cl−→Cu, HClC6H5Cl+N2(ii) Sandmeyer reactionC. 2CH3CH2Cl+2Na→EtherC2H5−C2H5+2NaCl(iii) Fittig reactionD. 2C6H5Cl+2Na→EtherC6H5−C6H5+2NaCl(iv) Gatterman reaction\displaystyle\begin{array}{|l|l|} \hline \textbf{List-I} & \textbf{List-II} \\ \hline \text{A. } C_6H_5N_2^+Cl^-\xrightarrow{Cu_2Cl_2}C_6H_5Cl+N_2 & \text{(i) Wurtz reaction} \\ \text{B. } C_6H_5N_2^+Cl^-\xrightarrow{Cu,\ HCl}C_6H_5Cl+N_2 & \text{(ii) Sandmeyer reaction} \\ \text{C. } 2CH_3CH_2Cl+2Na\xrightarrow{\text{Ether}}C_2H_5-C_2H_5+2NaCl & \text{(iii) Fittig reaction} \\ \text{D. } 2C_6H_5Cl+2Na\xrightarrow{\text{Ether}}C_6H_5-C_6H_5+2NaCl & \text{(iv) Gatterman reaction} \\ \hline \end{array} Choose the correct answer from the options given below
Not attempted
A
A - (ii), B - (i), C - (iv), D - (iii)
B
A - (iii), B - (i), C - (ii), D - (iv)
C
A - (iii), B - (iv), C - (i), D - (ii)
D
A - (ii), B - (iv), C - (i), D - (iii)
608
[JEE Main 2021, 26 February Shift 2, Q52] The number of stereoisomers possible for [Co(ox)2(Br)(NH3)]2−[Co(ox)_2(Br)(NH_3)]^{2-} is _______ [ox = oxalate]
Not attempted
Your answer: —
Correct answer: 3
609
[JEE Main 2021, 26 February Shift 2, Q45] Match List-I with List-II List-IList-IIA. Siderite(i) CuB. Calamine(ii) CaC. Malachite(iii) FeD. Cryolite(iv) Al(v) Zn\displaystyle\begin{array}{|l|l|} \hline \textbf{List-I} & \textbf{List-II} \\ \hline \text{A. Siderite} & \text{(i) Cu} \\ \text{B. Calamine} & \text{(ii) Ca} \\ \text{C. Malachite} & \text{(iii) Fe} \\ \text{D. Cryolite} & \text{(iv) Al} \\ & \text{(v) Zn} \\ \hline \end{array} Choose the correct answer from the options given below
Not attempted
A
A - (i), B - (ii), C - (iii), D - (iv)
B
A - (iii), B - (v), C - (i), D - (iv)
C
A - (iii), B - (i), C - (v), D - (ii)
D
A - (i), B - (ii), C - (v), D - (iii)
610
[JEE Main 2021, 26 February Shift 2, Q48] The nature of charge on resulting colloidal particles when FeCl3FeCl_3 is added to excess of hot water is
Not attempted
A
Positive
B
Sometimes positive and sometimes negative
C
Neutral
D
Negative
611
[JEE Main 2021, 26 February Shift 2, Q55] If the activation energy of a reaction is 80.9 kJ mol−180.9\ kJ\ mol^{-1}, the fraction of molecules at 700 K700\ K, having enough energy to react to form products is e−xe^{-x}. The value of xx is _______. [Use R=8.31 J K−1 mol−1R=8.31\ J\ K^{-1}\ mol^{-1}]
Not attempted
Your answer: —
Correct answer: 14
612
[JEE Main 2021, 26 February Shift 2, Q53] Emf of the following cell at 298 K298\ K in VV is x×10−2x\times10^{-2}. Zn∣Zn2+(0.1 M)∣∣Ag+(0.01 M)∣AgZn|Zn^{2+}(0.1\ M)||Ag^+(0.01\ M)|Ag The value of xx is _______. (Rounded off to the nearest integer) [Given: EZn2+/Zn∘=−0.76 VE^\circ_{Zn^{2+}/Zn}=-0.76\ V; EAg+/Ag∘=+0.80 VE^\circ_{Ag^+/Ag}=+0.80\ V; 2.303RTF=0.059\dfrac{2.303RT}{F}=0.059]
Not attempted
Your answer: —
Correct answer: 147
613
[JEE Main 2021, 26 February Shift 2, Q54] When 12.2 g12.2\ g of benzoic acid is dissolved in 100 g100\ g of water, the freezing point of solution was found to be −0.93∘C-0.93^\circ C (Kf(H2O)=1.86 K kg mol−1K_f(H_2O)=1.86\ K\ kg\ mol^{-1}). The number (nn) of benzoic acid molecules associated (assuming 100% association) is _______.
Not attempted
Your answer: —
Correct answer: 2
614
[JEE Main 2021, 26 February Shift 2, Q60] The number of octahedral voids per lattice site in a lattice is _______. (rounded off to the nearest integer)
Not attempted
Your answer: —
Correct answer: 1
615
[JEE Main 2021, 26 February Shift 2, Q32] Consider the below reaction, the major product among the following is Reagents: (1) Zn-Hg/HClZn\text{-}Hg/HCl, (2) Cr2O3Cr_2O_3, 773 K773\ K, 10-20 atm10\text{-}20\ atm
Not attempted
O
A
Option (A): see figure
CH₂CH₃
B
Option (B): see figure
COCH₂CH₃
C
Option (C): see figure
CH₂CH₂CH₃
D
Option (D): see figure
CH₃CH₃
616
[JEE Main 2021, 26 February Shift 2, Q34] Given below are two statements: one is labelled as Assertion A and the other is labelled as Reason R. Assertion A: In TlI3TlI_3, isomorphous to CsI3CsI_3, the metal is present in +1 oxidation state. Reason R: Tl metal has fourteen ff electrons in its electronic configuration. In the light of the above statements, choose the most appropriate answer from the options given below
Not attempted
A
Both A and R are correct and R is the correct explanation of A
B
A is not correct but R is correct
C
Both A and R are correct but R is not the correct explanation of A
D
A is correct but R is not correct
617
[JEE Main 2021, 26 February Shift 2, Q41] Which pair of oxides is acidic in nature?
Not attempted
A
N2O, BaON_2O,\ BaO
B
CaO, SiO2CaO,\ SiO_2
C
B2O3, SiO2B_2O_3,\ SiO_2
D
B2O3, CaOB_2O_3,\ CaO
618
[JEE Main 2021, 26 February Shift 2, Q37] Match List-I with List-II List-IList-IIA. Sodium Carbonate(i) DeaconB. Titanium(ii) Castner-KellnerC. Chlorine(iii) Van-ArkelD. Sodium hydroxide(iv) Solvay\displaystyle\begin{array}{|l|l|} \hline \textbf{List-I} & \textbf{List-II} \\ \hline \text{A. Sodium Carbonate} & \text{(i) Deacon} \\ \text{B. Titanium} & \text{(ii) Castner-Kellner} \\ \text{C. Chlorine} & \text{(iii) Van-Arkel} \\ \text{D. Sodium hydroxide} & \text{(iv) Solvay} \\ \hline \end{array} Choose the correct answer from the options given below
Not attempted
A
A - (iv), B - (i), C - (ii), D - (iii)
B
A - (iii), B - (ii), C - (i), D - (iv)
C
A - (i), B - (iii), C - (iv), D - (ii)
D
A - (iv), B - (iii), C - (i), D - (ii)
619
[JEE Main 2021, 26 February Shift 2, Q44] Calgon is used for water treatment. Which of the following statement is not true about Calgon?
Not attempted
A
It is also known as Graham's salt
B
Calgon contains the 2nd2^{nd} most abundant element by weight in the Earth's crust
C
It is polymeric compound and is water soluble
D
It doesnot remove Ca2+Ca^{2+} ion by precipitation
620
[JEE Main 2021, 26 February Shift 2, Q50] Which of the following forms of hydrogen emits low energy β−\beta^- particles?
Not attempted
A
Protium 11H^1_1H
B
Proton H+H^+
C
Tritium 13H^3_1H
D
Deuterium 12H^2_1H
621
[JEE Main 2021, 26 February Shift 2, Q57] In a mildly alkaline medium, thiosulphate ion is oxidized by MnO4−MnO_4^- to "A". The oxidation state of sulphur in "A" is _______.
Not attempted
Your answer: —
Correct answer: 6
622
[JEE Main 2021, 26 February Shift 2, Q51] The pH of ammonium phosphate solution, if pKapK_a of phosphoric acid and pKbpK_b of ammonium hydroxide are 5.235.23 and 4.754.75 respectively, is _______ (Round off to the Nearest Integer)
Not attempted
Your answer: —
Correct answer: 7
623
[JEE Main 2021, 26 February Shift 2, Q56] The average S-F bond energy in kJ mol−1kJ\ mol^{-1} of SF6SF_6 is _______. (Rounded off to the nearest integer) [Given: The values of standard enthalpy of formation of SF6(g)SF_6(g), S(g)S(g) and F(g)F(g) are −1100-1100, 275275 and 80 kJ mol−180\ kJ\ mol^{-1} respectively.]
Not attempted
Your answer: —
Correct answer: 309
624
[JEE Main 2021, 26 February Shift 2, Q38] In C1H2=C2=C3H−C4H3\overset{1}{C}H_2=\overset{2}{C}=\overset{3}{C}H-\overset{4}{C}H_3 molecule, the hybridization of carbon 1, 2, 3 and 4 respectively, are:
Not attempted
A
sp2,sp,sp2,sp3sp^2, sp, sp^2, sp^3
B
sp3,sp,sp3,sp3sp^3, sp, sp^3, sp^3
C
sp2,sp3,sp2,sp3sp^2, sp^3, sp^2, sp^3
D
sp2,sp2,sp2,sp3sp^2, sp^2, sp^2, sp^3
625
[JEE Main 2021, 26 February Shift 2, Q46] Match List-I with List-II List-I (Molecule)List-II (Bond order)A. Ne2(i) 1B. N2(ii) 2C. F2(iii) 0D. O2(iv) 3\displaystyle\begin{array}{|l|l|} \hline \textbf{List-I (Molecule)} & \textbf{List-II (Bond order)} \\ \hline \text{A. } Ne_2 & \text{(i) } 1 \\ \text{B. } N_2 & \text{(ii) } 2 \\ \text{C. } F_2 & \text{(iii) } 0 \\ \text{D. } O_2 & \text{(iv) } 3 \\ \hline \end{array} Choose the correct answer from the options given below
Not attempted
A
A - (iv), B - (iii), C - (ii), D - (i)
B
A - (ii), B - (i), C - (iv), D - (iii)
C
A - (iii), B - (iv), C - (i), D - (ii)
D
A - (i), B - (ii), C - (iii), D - (iv)
626
[JEE Main 2021, 26 February Shift 2, Q36] The correct order of electron gain enthalpy is
Not attempted
A
S>Se>Te>OS > Se > Te > O
B
Te>Se>S>OTe > Se > S > O
C
S>O>Se>TeS > O > Se > Te
D
O>S>Se>TeO > S > Se > Te
627
[JEE Main 2021, 26 February Shift 2, Q59] A ball weighing 10 g10\ g is moving with a velocity of 90 ms−190\ ms^{-1}. If the uncertainty in its velocity is 5%5\%, then the uncertainty in its position is _______ ×10−33 m\times10^{-33}\ m. (Rounded off to the nearest integer) [Given: h=6.63×10−34 Jsh=6.63\times10^{-34}\ Js]
Not attempted
Your answer: —
Correct answer: 1
628
[JEE Main 2021, 26 February Shift 2, Q58] The NaNO3NaNO_3 weighed out to make 50 mL50\ mL of an aqueous solution containing 70.0 mg Na+70.0\ mg\ Na^+ per mLmL is _______ gg. (Rounded off to the nearest integer) [Given: Atomic weight in g mol−1g\ mol^{-1}: Na: 23; N: 14; O: 16]
Not attempted
Your answer: —
Correct answer: 13
629
[JEE Main 2021, 26 February Shift 1, Q34] The structure of Neoprene is:
Not attempted
A
Option (A): see figure
CH₂CHCNn
B
Option (B): see figure
NNNNHCH₂HNNHn
C
Option (C): see figure
CH₂CHCHCH₂CH₂CHCNn
D
Option (D): see figure
CH₂CCHCH₂Cln
630
[JEE Main 2021, 26 February Shift 1, Q48] Which of the following vitamin is helpful in delaying the blood clotting ?
Not attempted
A
Vitamin E
B
Vitamin C
C
Vitamin K
D
Vitamin B
631
[JEE Main 2021, 26 February Shift 1, Q41] An amine on reaction with benzene sulphonyl chloride produces a compound insoluble in alkaline solution. This amine can be prepared by ammonolysis of ethyl chloride. The correct structure of amine is :
Not attempted
A
CH3CH2CH2NHCH3\mathrm{CH_3CH_2CH_2NHCH_3}
B
CH3CH2CH2−NH−CH2CH3\mathrm{CH_3CH_2CH_2-NH-CH_2CH_3}
C
CH3CH2NH2\mathrm{CH_3CH_2NH_2}
D
Option (D): see figure
NHCH₂CH₂CH₃
632
[JEE Main 2021, 26 February Shift 1, Q47] Given below are two statements : Statement I : o-Nitrophenol is steam volatile due to intramolecular hydrogen bonding. Statement II : o-Nitrophenol has high melting due to hydrogen bonding. In the light of the above statements, choose the most appropriate answer from the options given below
Not attempted
A
Both statement I and statement II are false
B
statement I is false but statement II is true
C
Statement I is true but statement II is false
D
Both statement I and statement II are true
633
[JEE Main 2021, 26 February Shift 1, Q50] Identify the major products A and B respectively in the following reactions of phenol :
Not attempted
OHBr₂ in CS₂273 KA(i) CHCl₃, NaOH(ii) H₃O⁺B
A
Option (A): see figure
OHBrandOHCHO
B
Option (B): see figure
OHBrandOHCHO
C
Option (C): see figure
OHBrandOHCHO
D
Option (D): see figure
OHBrandOHCHO
634
[JEE Main 2021, 26 February Shift 1, Q37] B reacts with Hydroxyl amine but does not give Tollen's test. Identify A and B.
Not attempted
A(C₄H₈Cl₂)Hydrolysis373 KB(C₄H₈O)
A
2,2-Dichlorobutane and Butanal
B
1,1-Dichlorobutane and 2-Butanone
C
2,2-Dichlorobutane and Butan-2-one
D
1, 1-Dichlorobutane and Butanal
635
[JEE Main 2021, 26 February Shift 1, Q53] Number of bridging CO ligands in [Mn2(CO)10]\mathrm{[Mn_2(CO)_{10}]} is
Not attempted
Your answer: —
Correct answer: 0
636
[JEE Main 2021, 26 February Shift 1, Q35] Which one of the following lanthanoids does not form MO2\mathrm{MO_2}? [M is lanthanoid metal]
Not attempted
A
Dy\mathrm{Dy}
B
Nd\mathrm{Nd}
C
Yb\mathrm{Yb}
D
Pr\mathrm{Pr}
637
[JEE Main 2021, 26 February Shift 1, Q57] Dichromate ion is treated with base, the oxidation number of Cr in the product formed is
Not attempted
Your answer: —
Correct answer: 6
638
[JEE Main 2021, 26 February Shift 1, Q33] Match List-1 with List-2. List-1 (ore)List-2 (Element present)(a) Kernite(i) Tin(b) Cassiterite(ii) Boron(c) Calamine(iii) Fluorine(d) Cryolite(iv) Zinc\displaystyle\begin{array}{|l|l|}\hline \textbf{List-1 (ore)} & \textbf{List-2 (Element present)} \\ \hline \text{(a) Kernite} & \text{(i) Tin} \\ \text{(b) Cassiterite} & \text{(ii) Boron} \\ \text{(c) Calamine} & \text{(iii) Fluorine} \\ \text{(d) Cryolite} & \text{(iv) Zinc} \\ \hline \end{array} Choose the most appropriate answer from the options given below :
Not attempted
A
(a)→(ii), (b)→(iv), (c)→(i), (d)→(iii)\text{(a)}\to\text{(ii)},\ \text{(b)}\to\text{(iv)},\ \text{(c)}\to\text{(i)},\ \text{(d)}\to\text{(iii)}
B
(a)→(ii), (b)→(i), (c)→(iv), (d)→(iii)\text{(a)}\to\text{(ii)},\ \text{(b)}\to\text{(i)},\ \text{(c)}\to\text{(iv)},\ \text{(d)}\to\text{(iii)}
C
(a)→(iii), (b)→(i), (c)→(ii), (d)→(iv)\text{(a)}\to\text{(iii)},\ \text{(b)}\to\text{(i)},\ \text{(c)}\to\text{(ii)},\ \text{(d)}\to\text{(iv)}
D
(a)→(i), (b)→(iii), (c)→(iv), (d)→(ii)\text{(a)}\to\text{(i)},\ \text{(b)}\to\text{(iii)},\ \text{(c)}\to\text{(iv)},\ \text{(d)}\to\text{(ii)}
639
[JEE Main 2021, 26 February Shift 1, Q59] 3.12 g of oxygen is adsorbed on 1.2 g of platinum metal. The volume of oxygen adsorbed per gram of the adsorbent at 1 atm and 300 K in L is ______.
Not attempted
Your answer: —
Correct answer: 2
640
[JEE Main 2021, 26 February Shift 1, Q54] An exothermic reaction X→Y\mathrm{X \rightarrow Y} has an activation energy 30 kJ mol−130\ \mathrm{kJ\ mol^{-1}}. If energy change ΔE\Delta E during the reaction is −20-20 kJ, then the activation energy for the reverse reaction in kJ is _____.
Not attempted
Your answer: —
Correct answer: 50
641
[JEE Main 2021, 26 February Shift 1, Q51] Consider the following reaction MnO4−+8H++5e−→Mn2++4H2O, E∘=1.51 V\mathrm{MnO_4^- + 8H^+ + 5e^- \rightarrow Mn^{2+} + 4H_2O,\ E^\circ = 1.51\ V} The quantity of electricity required in Faraday to reduce five moles of MnO4−\mathrm{MnO_4^-} is ____.
Not attempted
Your answer: —
Correct answer: 25
642
[JEE Main 2021, 26 February Shift 1, Q56] 224 mL of SO2(g)\mathrm{SO_2(g)} at 298 K and 1 atm is passed through 100 mL of 0.1 M NaOH solution. The non-volatile solute produced is dissolved in 36 g of water. The lowering of vapour pressure of solution (assuming the solution is dilute) (PH2Oo=24 mm of Hg)\left(P^o_{H_2O} = 24\ \mathrm{mm\ of\ Hg}\right) is x×10−2x \times 10^{-2} mm of Hg, the value of xx is _______. (Integer answer)
Not attempted
Your answer: —
Correct answer: 24
643
[JEE Main 2021, 26 February Shift 1, Q38] The presence of ozone in troposphere
Not attempted
A
protects us from the radiation
B
protects us from greenhouse effect
C
protects us from the UV radiation
D
generates photochemical smog
644
[JEE Main 2021, 26 February Shift 1, Q42] For the given reaction: What is 'A'?
Not attempted
CHCHBrCH₃1. NaNH₂2. Red hot iron tube, 873 K(A)(major product)
A
CH3CH2CH2NH2\mathrm{CH_3CH_2CH_2NH_2}
B
Option (B): see figure
CHCHNH₂CH₃
C
Option (C): see figure
CH₃CH₃CH₃
D
Option (D): see figure
645
[JEE Main 2021, 26 February Shift 1, Q43] For the given reaction : What is 'A'?
Not attempted
CH₂CH₃CNBr₂UV light'A'(major product)monobrominated
A
Option (A): see figure
CH₂CH₃BrCN
B
Option (B): see figure
CH₂CH₃BrCN
C
Option (C): see figure
CH₂CH₃BrCN
D
Option (D): see figure
CNCHBrCH₃
646
[JEE Main 2021, 26 February Shift 1, Q40] Which of the following is 'a' FALSE statement?
Not attempted
A
Kjeldahl's method is used for the estimation of nitrogen in an organic compound
B
Carius tube is used in the estimation of sulphur in an organic compound
C
Carius method is used for the estimation of nitrogen in an organic compound
D
Phosphoric acid produced on oxidation of phosphorus present in an organic compound is precipitated as Mg2P2O7\mathrm{Mg_2P_2O_7} by adding magnesia mixture
647
[JEE Main 2021, 26 February Shift 1, Q45] Given below are two statements : Statement I : A mixture of chloroform and aniline can be separated by simple distillation. Statement II : When separating aniline from a mixture of aniline and water by steam distillation aniline boils below its boiling point. In the light of the above statements, choose the most appropriate answer from the options given below :
Not attempted
A
Both statement I and statement II are true
B
Both Statement I and Statement II are false
C
Statement I is false but Statement II is true
D
Statement I is true but Statement II is false
648
[JEE Main 2021, 26 February Shift 1, Q32] Compound A used as a strong oxidizing agent is amphoteric in nature. It is the part of lead storage batteries. Compound A is :
Not attempted
A
PbO2\mathrm{PbO_2}
B
PbSO4\mathrm{PbSO_4}
C
Pb3O4\mathrm{Pb_3O_4}
D
PbO\mathrm{PbO}
649
[JEE Main 2021, 26 February Shift 1, Q39] On treating a compound with warm dil. H2SO4\mathrm{H_2SO_4}, gas X is evolved which turns K2Cr2O7\mathrm{K_2Cr_2O_7} solution acidified with dil. H2SO4\mathrm{H_2SO_4} to a green compound Y. X and Y respectively are :
Not attempted
A
X=SO2, Y=Cr2(SO4)3\mathrm{X = SO_2,\ Y = Cr_2(SO_4)_3}
B
X=SO2, Y=Cr2O3\mathrm{X = SO_2,\ Y = Cr_2O_3}
C
X=SO3, Y=Cr2(SO4)3\mathrm{X = SO_3,\ Y = Cr_2(SO_4)_3}
D
X=SO3, Y=Cr2O3\mathrm{X = SO_3,\ Y = Cr_2O_3}
650
[JEE Main 2021, 26 February Shift 1, Q44] Find A, B and C in the following reactions : NH3+A+CO2→(NH4)2CO3\mathrm{NH_3 + A + CO_2 \rightarrow (NH_4)_2CO_3} (NH4)2CO3+H2O+B→NH4HCO3\mathrm{(NH_4)_2CO_3 + H_2O + B \rightarrow NH_4HCO_3} NH4HCO3+NaCl→NH4Cl+C\mathrm{NH_4HCO_3 + NaCl \rightarrow NH_4Cl + C}
Not attempted
A
A−H2O; B−CO2; C−NaHCO3\mathrm{A - H_2O;\ B - CO_2;\ C - NaHCO_3}
B
A−O2; B−CO2; C−Na2CO3\mathrm{A - O_2;\ B - CO_2;\ C - Na_2CO_3}
C
A−H2O; B−O2; C−NaHCO3\mathrm{A - H_2O;\ B - O_2;\ C - NaHCO_3}
D
A−H2O; B−O2; C−Na2CO3\mathrm{A - H_2O;\ B - O_2;\ C - Na_2CO_3}
651
[JEE Main 2021, 26 February Shift 1, Q49] Statements about heavy water are given below. A. Heavy water is used in exchange reactions for the study of reaction mechanisms. B. Heavy water is prepared by exhaustive electrolysis of water. C. Heavy water has higher boiling point than ordinary water. D. Viscosity of H2O\mathrm{H_2O} is greater than D2O\mathrm{D_2O}. Choose the most appropriate answer from the options given below :
Not attempted
A
A, B and C only
B
A and D only
C
A and C only
D
A and B only
652
[JEE Main 2021, 26 February Shift 1, Q58] A homogeneous ideal gaseous reaction AB2(g)⇌A(g)+2B(g)\mathrm{AB_{2(g)} \rightleftharpoons A_{(g)} + 2B_{(g)}} is carried out in a 25 litre flask at 27∘27^\circC. The initial amount of AB2\mathrm{AB_2} was 1 mole an the equilibrium pressure was 1.9 atm. The value of KPK_P is x×10−2x \times 10^{-2}. The value of xx is _____. (Integer answer)
Not attempted
Your answer: —
Correct answer: 73
653
[JEE Main 2021, 26 February Shift 1, Q52] For a chemical reaction A+B⇌C+D\mathrm{A + B \rightleftharpoons C + D} (ΔrHΘ=80 kJ mol−1)(\Delta_rH^\Theta = 80\ \mathrm{kJ\ mol^{-1}}) the entropy change ΔrSΘ\Delta_rS^\Theta depends on the temperature TT (in K) as ΔrSΘ=2T (J K−1 mol−1)\Delta_rS^\Theta = 2T\ (\mathrm{J\ K^{-1}\ mol^{-1}}). Minimum temperature at which it will become spontaneous is ____________K. (Integer)
Not attempted
Your answer: —
Correct answer: 200
654
[JEE Main 2021, 26 February Shift 1, Q55] A certain gas obeys P(Vm−b)=RTP(V_m - b) = RT. The value of (∂Z∂P)T\left(\dfrac{\partial Z}{\partial P}\right)_T is xbRT\dfrac{xb}{RT}. The value of xx is _____. (ZZ : compressibility factor)
Not attempted
Your answer: —
Correct answer: 1
655
[JEE Main 2021, 26 February Shift 1, Q46] Given below are two statements : one is labelled as Assertion A and the other is labelled as Reason R. Assertion A : Dipole-dipole interactions are the only non-covalent interactions, resulting in hydrogen bond formation. Reason R : Fluorine is the most electronegative element and hydrogen bonds in HF are symmetrical. In the light of the above statements, choose the most appropriate answer from the options given below :
Not attempted
A
A is true but R is false
B
Both A and R are true but R is NOT the correct explanation of A
C
Both A and R are true and R is the correct explanation of A
D
A is false but R is true
656
[JEE Main 2021, 26 February Shift 1, Q31] Match List-I with List-II. List-I (Electronic configuration of elements)List-II (ΔiH in kJ mol−1)(a) 1s2 2s2(i) 801(b) 1s2 2s2 2p4(ii) 899(c) 1s2 2s2 2p3(iii) 1314(d) 1s2 2s2 2p1(iv) 1402\displaystyle\begin{array}{|l|l|}\hline \textbf{List-I (Electronic configuration of elements)} & \textbf{List-II } (\Delta_i H \text{ in kJ mol}^{-1}) \\ \hline \text{(a)}\ 1s^2\,2s^2 & \text{(i)}\ 801 \\ \text{(b)}\ 1s^2\,2s^2\,2p^4 & \text{(ii)}\ 899 \\ \text{(c)}\ 1s^2\,2s^2\,2p^3 & \text{(iii)}\ 1314 \\ \text{(d)}\ 1s^2\,2s^2\,2p^1 & \text{(iv)}\ 1402 \\ \hline \end{array} Choose the most appropriate answer from the options given below :
Not attempted
A
(a)→(ii), (b)→(iii), (c)→(iv), (d)→(i)\text{(a)}\to\text{(ii)},\ \text{(b)}\to\text{(iii)},\ \text{(c)}\to\text{(iv)},\ \text{(d)}\to\text{(i)}
B
(a)→(i), (b)→(iii), (c)→(i), (d)→(ii)\text{(a)}\to\text{(i)},\ \text{(b)}\to\text{(iii)},\ \text{(c)}\to\text{(i)},\ \text{(d)}\to\text{(ii)}
C
(a)→(iv), (b)→(i), (c)→(ii), (d)→(iii)\text{(a)}\to\text{(iv)},\ \text{(b)}\to\text{(i)},\ \text{(c)}\to\text{(ii)},\ \text{(d)}\to\text{(iii)}
D
(a)→(i), (b)→(iv), (c)→(iii), (d)→(ii)\text{(a)}\to\text{(i)},\ \text{(b)}\to\text{(iv)},\ \text{(c)}\to\text{(iii)},\ \text{(d)}\to\text{(ii)}
657
[JEE Main 2021, 26 February Shift 1, Q36] The orbital having two radial as well as two angular nodes is :
Not attempted
A
3p
B
5d
C
4f
D
4d
658
[JEE Main 2021, 26 February Shift 1, Q60] The number of significant figures in 50000.020×10−350000.020 \times 10^{-3} is
Not attempted
Your answer: —
Correct answer: 8
659
[JEE Main 2021, 25 February Shift 2, Q40] Which of the following is correct structure of α\alpha-anomer of maltose?
Not attempted
A
Option (A): see figure
OCH₂OHHHHOHHHOHHOOCH₂OHHHOHHOHHHOHO
B
Option (B): see figure
OCH₂OHHHHOHOHHHHOOCH₂OHHHOHHOHOHHHO
C
Option (C): see figure
OCH₂OHHHHOHOHHHHOOCH₂OHHOHHHOHOHHHO
D
Option (D): see figure
OCH₂OHHHHOHHOHHHOOCH₂OHHOHHHOHHHOHO
660
[JEE Main 2021, 25 February Shift 2, Q38] Carbylamine test is used to detect the presence of primary amino group in an organic compound. Which of the following compound is formed when this test is performed with aniline?
Not attempted
A
Option (A): see figure
CONH₂
B
Option (B): see figure
NC
C
Option (C): see figure
CN
D
Option (D): see figure
NHCH₃
661
[JEE Main 2021, 25 February Shift 2, Q42] Correct statement about the given chemical reaction is:
Not attempted
NH₂HNO₃, H₂SO₄288 KNH₂NO₂(A)+NH₂NO₂(B)+NH₂NO₂(C)
A
Reaction is possible and compound (B) will be the major product
B
Reaction is possible and compound (A) will be major product
C
−NH2-\mathrm{NH_2} group is ortho and para directive, so product (B) is not possible
D
The reaction will form sulphonated product instead of nitration
662
[JEE Main 2021, 25 February Shift 2, Q58] The number of compound/s given below which contain/s −COOH-\mathrm{COOH} group is ______. (Integer answer) (A) Sulphanilic acid (B) Picric acid (C) Aspirin (D) Ascorbic acid
Not attempted
Your answer: —
Correct answer: 1
663
[JEE Main 2021, 25 February Shift 2, Q41] What is X\mathrm{X} in the given reaction? HOCH2−CH2OH+oxalic acid→210∘CX\mathrm{HOCH_2{-}CH_2OH + oxalic\ acid \xrightarrow{210^\circ C} X} (major product)
Not attempted
A
CH2OH−CHO\mathrm{CH_2OH{-}CHO}
B
CH2=CH2\mathrm{CH_2{=}CH_2}
C
OHC−CHO\mathrm{OHC{-}CHO}
D
CH(OH)=CH2\mathrm{CH(OH){=}CH_2}
664
[JEE Main 2021, 25 February Shift 2, Q46] In which of the following order the given complex ions are arranged correctly with respect to their decreasing spin only magnetic moment? (i) [FeF6]3−[\mathrm{FeF_6}]^{3-} (ii) [Co(NH3)6]3+[\mathrm{Co(NH_3)_6}]^{3+} (iii) [NiCl4]2−[\mathrm{NiCl_4}]^{2-} (iv) [Cu(NH3)4]2+[\mathrm{Cu(NH_3)_4}]^{2+}
Not attempted
A
(i) >> (iii) >> (iv) >> (ii)
B
(ii) >> (i) >> (iii) >> (iv)
C
(iii) >> (iv) >> (ii) >> (i)
D
(ii) >> (iii) >> (i) >> (iv)
665
[JEE Main 2021, 25 February Shift 2, Q47] Given below are two statements: Statement I\textbf{Statement I}: The identification of Ni2+\mathrm{Ni^{2+}} is carried out by dimethyl glyoxime in the presence of NH4OH\mathrm{NH_4OH}. Statement II\textbf{Statement II}: The dimethyl glyoxime is a bidentate neutral ligand. In the light of the above statements, choose the correct answer from the options given below:
Not attempted
A
Both Statement I and statement II are false
B
Statement I is true but Statement II is false
C
Both Statement I and Statement II is true
D
Statement I is false but Statement II is true
666
[JEE Main 2021, 25 February Shift 2, Q36] The major components of German Silver are
Not attempted
A
Ge, Cu and Ag
B
Cu, Zn and Ni
C
Zn, Ni and Ag
D
Cu, Zn and Ag
667
[JEE Main 2021, 25 February Shift 2, Q59] The spin only magnetic moment of a divalent ion in an aqueous solution (atomic number 2929) is ______ BM. (round off your answer to the nearest integer)
Not attempted
Your answer: —
Correct answer: 2
668
[JEE Main 2021, 25 February Shift 2, Q37] The method used for the purification of Indium is
Not attempted
A
Van Arkel method
B
Liquation
C
Vapour phase refining
D
Zone refining
669
[JEE Main 2021, 25 February Shift 2, Q39] Which one of the following statements is FALSE for hydrophilic sols?
Not attempted
A
Their viscosity is of the order of that of H2O\mathrm{H_2O}
B
They do not require electrolytes for stability
C
These sols are reversible in nature
D
The sols cannot be easily coagulated
670
[JEE Main 2021, 25 February Shift 2, Q60] The rate constant of a reaction increases by five times on increase in temperature from 27∘C27^\circ\mathrm{C} to 52∘C52^\circ\mathrm{C}. The value of activation energy in kJ mol−1\mathrm{kJ\ mol^{-1}} is ______. (Rounded-off to the nearest integer) [R=8.314 J K−1 mol−1R = 8.314\ \mathrm{J\ K^{-1}\ mol^{-1}}]
Not attempted
Your answer: —
Correct answer: 52
671
[JEE Main 2021, 25 February Shift 2, Q51] Copper reduces NO3−\mathrm{NO_3^-} into NO\mathrm{NO} and NO2\mathrm{NO_2} depending upon the concentration of HNO3\mathrm{HNO_3} in solution. (Assuming fixed [Cu2+][\mathrm{Cu^{2+}}] and PNO=PNO2P_{\mathrm{NO}} = P_{\mathrm{NO_2}}), the HNO3\mathrm{HNO_3} concentration at which the thermodynamic tendency for reduction of NO3−\mathrm{NO_3^-} into NO\mathrm{NO} and NO2\mathrm{NO_2} by copper is same is 10x10^{x} M. The value of 2x2x is ______. (Rounded-off to the nearest integer) [Given: ECu2+/Cu∘=0.34E^\circ_{\mathrm{Cu^{2+}/Cu}} = 0.34 V, ENO3−/NO∘=0.96E^\circ_{\mathrm{NO_3^-/NO}} = 0.96 V, ENO3−/NO2∘=0.79E^\circ_{\mathrm{NO_3^-/NO_2}} = 0.79 V and at 298 K, RTF(2.303)=0.059\frac{RT}{F}(2.303) = 0.059]
Not attempted
Your answer: —
Correct answer: 4
672
[JEE Main 2021, 25 February Shift 2, Q52] If a compound AB\mathrm{AB} dissociates to the extent of 75%75\% in an aqueous solution, the molality of the solution which shows a 2.52.5 K rise in the boiling point of the solution is ______ molal. (Rounded-off to the nearest integer) [Kb=0.52 K kg mol−1K_b = 0.52\ \mathrm{K\ kg\ mol^{-1}}]
Not attempted
Your answer: —
Correct answer: 3
673
[JEE Main 2021, 25 February Shift 2, Q54] The unit cell of copper corresponds to a face centered cube of edge length 3.5963.596 Å with one copper atom at each lattice point. The calculated density of copper in kg/m3\mathrm{kg/m^3} is ______. [Molar mass of Cu: 63.5463.54 g; Avogadro Number =6.022×1023= 6.022\times10^{23}]
Not attempted
Your answer: —
Correct answer: 9076
674
[JEE Main 2021, 25 February Shift 2, Q44] Given below are two statements: Statement I\textbf{Statement I}: The pH of rain water is normally ∼5.6\sim5.6. Statement II\textbf{Statement II}: If the pH of rain water drops below 5.65.6, it is called acid rain. In the light of the above statements, choose the correct answer from the options given below:
Not attempted
A
Statement I is true but statement II is false
B
Both Statement I and Statement II are false
C
Statement I is false but statement II is true
D
Both Statement I and Statement II are true
675
[JEE Main 2021, 25 February Shift 2, Q31] The major product of the following reaction is:
Not attempted
NO₂H₂SO₄
A
Option (A): see figure
NO₂
B
Option (B): see figure
NO₂
C
Option (C): see figure
NO₂
D
Option (D): see figure
NO₂
676
[JEE Main 2021, 25 February Shift 2, Q34] The correct sequence of reagents used in the preparation of 4-bromo-2-nitroethylbenzene from benzene is
Not attempted
A
CH3COCl/AlCl3, Zn−Hg/HCl, Br2/AlBr3, HNO3/H2SO4\mathrm{CH_3COCl/AlCl_3,\ Zn{-}Hg/HCl,\ Br_2/AlBr_3,\ HNO_3/H_2SO_4}
B
HNO3/H2SO4, Br2/AlCl3, CH3COCl/AlCl3, Zn−Hg/HCl\mathrm{HNO_3/H_2SO_4,\ Br_2/AlCl_3,\ CH_3COCl/AlCl_3,\ Zn{-}Hg/HCl}
C
Br2/AlBr3, CH3COCl/AlCl3, HNO3/H2SO4, Zn/HCl\mathrm{Br_2/AlBr_3,\ CH_3COCl/AlCl_3,\ HNO_3/H_2SO_4,\ Zn/HCl}
D
CH3COCl/AlCl3, Br2/AlBr3, HNO3/H2SO4, Zn/HCl\mathrm{CH_3COCl/AlCl_3,\ Br_2/AlBr_3,\ HNO_3/H_2SO_4,\ Zn/HCl}
677
[JEE Main 2021, 25 February Shift 2, Q48] The major product of the following reaction is: CH3CH2CH=CH2→Rh catalystH2/CO\mathrm{CH_3CH_2CH{=}CH_2 \xrightarrow[Rh\ catalyst]{H_2/CO}}
Not attempted
A
CH3CH2CH=CH−CHO\mathrm{CH_3CH_2CH{=}CH{-}CHO}
B
CH3CH2CH2CHO\mathrm{CH_3CH_2CH_2CHO}
C
CH3CH2C(CHO)=CH2\mathrm{CH_3CH_2C(CHO){=}CH_2}
D
CH3CH2CH2CH2CHO\mathrm{CH_3CH_2CH_2CH_2CHO}
678
[JEE Main 2021, 25 February Shift 2, Q33] The correct order of acid character of the following compounds is:
Not attempted
OHICOOHNO₂IICOOHIIICOOHCH₃IV
A
IV >> III >> II >> I
B
II >> III >> IV >> I
C
III >> II >> I >> IV
D
I >> II >> III >> IV
679
[JEE Main 2021, 25 February Shift 2, Q35] Which of the following compound is added to the sodium extract before addition of silver nitrate for testing of halogens?
Not attempted
A
Ammonia
B
Hydrochloric acid
C
Nitric acid
D
Sodium hydroxide
680
[JEE Main 2021, 25 February Shift 2, Q45] Given below are two statements: Statement I\textbf{Statement I}: α\alpha and β\beta forms of sulphur can change reversibly between themselves with slow heating or slow cooling. Statement II\textbf{Statement II}: At room temperature the stable crystalline form of sulphur is monoclinic sulphur. In the light of the above statements, choose the correct answer from the options given below
Not attempted
A
Statement I is true but statement II is false
B
Both Statement I and Statement II are true
C
Both Statement I and Statement II are false
D
Statement I is false but statement II is true
681
[JEE Main 2021, 25 February Shift 2, Q49] The correct order of bond dissociation enthalpy of halogens is
Not attempted
A
Cl2>Br2>F2>I2\mathrm{Cl_2 > Br_2 > F_2 > I_2}
B
Cl2>F2>Br2>I2\mathrm{Cl_2 > F_2 > Br_2 > I_2}
C
F2>Cl2>Br2>I2\mathrm{F_2 > Cl_2 > Br_2 > I_2}
D
I2>Br2>Cl2>F2\mathrm{I_2 > Br_2 > Cl_2 > F_2}
682
[JEE Main 2021, 25 February Shift 2, Q55] Among the following number of metal/s which can be used as electrodes in the photoelectric cell is ______ (Integer answer) (A) Li (B) Na (C) Rb (D) Cs
Not attempted
Your answer: —
Correct answer: 1
683
[JEE Main 2021, 25 February Shift 2, Q32] Water does not produce CO on reacting with
Not attempted
A
CH4\mathrm{CH_4}
B
C\mathrm{C}
C
C3H8\mathrm{C_3H_8}
D
CO2\mathrm{CO_2}
684
[JEE Main 2021, 25 February Shift 2, Q43] The solubility of Ca(OH)2\mathrm{Ca(OH)_2} in water is: [Given: The solubility product of Ca(OH)2\mathrm{Ca(OH)_2} in water =5.5×10−6= 5.5\times10^{-6}]
Not attempted
A
1.11×10−61.11\times10^{-6}
B
1.77×10−61.77\times10^{-6}
C
1.77×10−21.77\times10^{-2}
D
1.11×10−21.11\times10^{-2}
685
[JEE Main 2021, 25 February Shift 2, Q53] Five moles of an ideal gas at 293293 K is expanded isothermally from an initial pressure of 2.12.1 MPa to 1.31.3 MPa against at constant external pressure 4.34.3 MPa. The heat transferred in this process is ______ kJ mol−1\mathrm{kJ\ mol^{-1}}. (Rounded-off to the nearest integer) [Use R=8.314 J mol−1K−1R = 8.314\ \mathrm{J\ mol^{-1}K^{-1}}]
Not attempted
Your answer: —
Correct answer: 15
686
[JEE Main 2021, 25 February Shift 2, Q50] Which among the following species has unequal bond lengths?
Not attempted
A
XeF4\mathrm{XeF_4}
B
SiF4\mathrm{SiF_4}
C
SF4\mathrm{SF_4}
D
BF4−\mathrm{BF_4^-}
687
[JEE Main 2021, 25 February Shift 2, Q56] Electromagnetic radiation of wavelength 663663 nm is just sufficient to ionize the atom of metal A. The ionization energy of metal A in kJ mol−1\mathrm{kJ\ mol^{-1}} is ______. (Rounded-off to the nearest integer) [h=6.63×10−34h = 6.63\times10^{-34} Js, c=3.00×108 m s−1c = 3.00\times10^{8}\ \mathrm{m\ s^{-1}}, NA=6.02×1023 mol−1N_A = 6.02\times10^{23}\ \mathrm{mol^{-1}}]
Not attempted
Your answer: —
Correct answer: 181
688
[JEE Main 2021, 25 February Shift 2, Q57] Consider titration of NaOH solution versus 1.251.25 M oxalic acid solution. At the end point following burette readings were obtained. (i) 4.54.5 mL (ii) 4.54.5 mL (iii) 4.44.4 mL (iv) 4.44.4 mL (v) 4.44.4 mL If the volume of oxalic acid taken was 10.010.0 mL then the molarity of the NaOH solution is ______ M. (Rounded-off to the nearest integer)
Not attempted
Your answer: —
Correct answer: 6
689
[JEE Main 2021, 25 February Shift 1, Q38] Which statement is correct?
Not attempted
A
Buna-S is a synthetic and linear thermosetting polymer
B
Synthesis of Buna-S needs nascent oxygen
C
Neoprene is an addition copolymer used in plastic bucket manufacturing
D
Buna-N is a natural polymer
690
[JEE Main 2021, 25 February Shift 1, Q42] Which of the glycosidic linkage between galactose and glucose is present in lactose?
Not attempted
A
C-1 of galactose and C-4 of glucose
B
C-1 of galactose and C-6 of glucose
C
C-1 of glucose and C-4 of galactose
D
C-1 of glucose and C-6 of galactose
691
[JEE Main 2021, 25 February Shift 1, Q36] Which of the following reaction/s will not give pp-aminoazobenzene?
Not attempted
(A)NO₂(i) Sn/HCl(ii) HNO₂(iii) Aniline(B)NO₂(i) NaBH₄(ii) NaOH(iii) Aniline(C)NH₂(i) HNO₂(ii) Aniline, HCl
A
C only
B
A and B
C
B only
D
A only
692
[JEE Main 2021, 25 February Shift 1, Q31] Compound(s) which will liberate carbon dioxide with sodium bicarbonate solution is/are:
Not attempted
A =NH₂NH₂NH₂OHB =COOHC =OHNO₂NO₂NO₂
A
A and B only
B
C only
C
B and C only
D
B only
693
[JEE Main 2021, 25 February Shift 1, Q37] Which one of the following reactions will not form acetaldehyde?
Not attempted
A
CH2=CH2+O2→H2OPd(II)/Cu(II)\mathrm{CH_2=CH_2 + O_2 \xrightarrow[H_2O]{Pd(II)/Cu(II)}}
B
CH3CN→ii) H2Oi) DIBAL-H\mathrm{CH_3CN \xrightarrow[ii)\ H_2O]{i)\ DIBAL\text{-}H}}
C
CH3CH2OH→573 KCu\mathrm{CH_3CH_2OH \xrightarrow[573\ K]{Cu}}
D
CH3CH2OH→CrO3-H2SO4\mathrm{CH_3CH_2OH \xrightarrow{CrO_3\text{-}H_2SO_4}}
694
[JEE Main 2021, 25 February Shift 1, Q50] The major product of the following chemical reaction is: CH3CH2CN→3) Pd/BaSO4, H21) H3O+, Δ  2) SOCl2 ?\mathrm{CH_3CH_2CN \xrightarrow[3)\ Pd/BaSO_4,\ H_2]{1)\ H_3O^+,\ \Delta\ \ 2)\ SOCl_2}\ ?}
Not attempted
A
CH3CH2CH3\mathrm{CH_3CH_2CH_3}
B
CH3CH2CH2OH\mathrm{CH_3CH_2CH_2OH}
C
(CH3CH2CO)2O\mathrm{(CH_3CH_2CO)_2O}
D
CH3CH2CHO\mathrm{CH_3CH_2CHO}
695
[JEE Main 2021, 25 February Shift 1, Q58] Consider the following chemical reaction. CH≡CH→2) CO, HCl, AlCl31) Red hot Fe tube, 873 K Product\mathrm{CH \equiv CH \xrightarrow[2)\ CO,\ HCl,\ AlCl_3]{1)\ Red\ hot\ Fe\ tube,\ 873\ K}\ Product} The number of sp2sp^2 hybridized carbon atom(s) present in the product is _____.
Not attempted
Your answer: —
Correct answer: 7
696
[JEE Main 2021, 25 February Shift 1, Q33] Identify A and B in the chemical reaction.
Not attempted
OCH₃NO₂HCl[A](major)NaIdry acetone[B](major)
A
Option (A): see figure
A =OCH₃ClNO₂B =IClNO₂
B
Option (B): see figure
A =OCH₃ClNO₂B =IClNO₂
C
Option (C): see figure
A =OCH₃ClNO₂B =OCH₃INO₂
D
Option (D): see figure
A =OCH₃ClNO₂B =OCH₃ClNO₂
697
[JEE Main 2021, 25 February Shift 1, Q41] The hybridization and magnetic nature of [Mn(CN)6]4−[\mathrm{Mn(CN)_6}]^{4-} and [Fe(CN)6]3−[\mathrm{Fe(CN)_6}]^{3-}, respectively are
Not attempted
A
sp3d2sp^3d^2 and diamagnetic
B
d2sp3d^2sp^3 and paramagnetic
C
d2sp3d^2sp^3 and diamagnetic
D
sp3d2sp^3d^2 and paramagnetic
698
[JEE Main 2021, 25 February Shift 1, Q46] Given below are two statements: Statement I: CeO2\mathrm{CeO_2} can be used for oxidation of aldehydes and ketones. Statement II: Aqueous solution of EuSO4\mathrm{EuSO_4} is a strong reducing agent. In the light of the above statements, choose the correct answer from the options given below
Not attempted
A
Both Statement I and Statement II are false
B
Both Statement I and Statement II are true
C
Statement I is false but Statement II is true
D
Statement I is true but Statement II is false
699
[JEE Main 2021, 25 February Shift 1, Q49] In which of the following pairs, the outer most electronic configuration will be the same?
Not attempted
A
Ni2+\mathrm{Ni^{2+}} and Cu+\mathrm{Cu^{+}}
B
Fe2+\mathrm{Fe^{2+}} and Co+\mathrm{Co^{+}}
C
Cr+\mathrm{Cr^{+}} and Mn2+\mathrm{Mn^{2+}}
D
V2+\mathrm{V^{2+}} and Cr+\mathrm{Cr^{+}}
700
[JEE Main 2021, 25 February Shift 1, Q32] Ellingham diagram is a graphical representation of
Not attempted
A
ΔH\Delta H vs TT
B
ΔG\Delta G vs TT
C
ΔG\Delta G vs PP
D
(ΔG−TΔS)(\Delta G - T\Delta S) vs TT
701
[JEE Main 2021, 25 February Shift 1, Q39] In Freundlich adsorption isotherm at moderate pressure, the extent of adsorption (xm)\left(\dfrac{x}{m}\right) is directly proportional to PxP^x. The value of xx is
Not attempted
A
11
B
Zero
C
∞\infty
D
1n\dfrac{1}{n}
702
[JEE Main 2021, 25 February Shift 1, Q56] For the reaction aA+bB→cC+dD\mathrm{aA + bB \rightarrow cC + dD}, the plot of log⁡k\log k vs 1T\dfrac{1}{T} is given below. The temperature at which the rate constant of the reaction is 10−4 s−110^{-4}\ \mathrm{s^{-1}} is _____ K. (Rounded-off to the nearest integer) [Given: The rate constant of the reaction is 10−5 s−110^{-5}\ \mathrm{s^{-1}} at 500500 K.]
Not attempted
log k1/Tslope = −10000 K
Your answer: —
Correct answer: 526
703
[JEE Main 2021, 25 February Shift 1, Q57] 11 molal aqueous solution of an electrolyte A2B3\mathrm{A_2B_3} is 60%60\% ionised. The boiling point of the solution at 11 atm is _____ K. (Rounded-off to the nearest integer) [Given KbK_b for (H2O)=0.52(\mathrm{H_2O}) = 0.52 K kg mol−1^{-1}]
Not attempted
Your answer: —
Correct answer: 375
704
[JEE Main 2021, 25 February Shift 1, Q35] Given below are two statements: Statement I: An allotrope of oxygen is an important intermediate in the formation of reducing smog. Statement II: Gases such as oxides of nitrogen and sulphur present in troposphere contribute to the formation of photochemical smog. In the light of the above statements, choose the correct answer from the options given below.
Not attempted
A
Both Statement I and Statement II are false
B
Statement I is true but Statement II is false
C
Both Statement I and Statement II are true
D
Statement I is false but Statement II is true
705
[JEE Main 2021, 25 February Shift 1, Q34] Identify A in the given chemical reaction.
Not attempted
CH₃CH₂CH₂CH₂CHCH₃CH₃Mo₂O₃773 K, 10-20 atm'A'major product
A
Option (A): see figure
CH₃
B
Option (B): see figure
C
Option (C): see figure
CH₃
D
Option (D): see figure
706
[JEE Main 2021, 25 February Shift 1, Q48] Complete combustion of 1.801.80 g of an oxygen containing compound (CxHyOz)(\mathrm{C_xH_yO_z}) gave 2.642.64 g of CO2\mathrm{CO_2} and 1.081.08 g of H2O\mathrm{H_2O}. The percentage of oxygen in the organic compound is
Not attempted
A
51.6351.63
B
63.5363.53
C
50.3350.33
D
53.3353.33
707
[JEE Main 2021, 25 February Shift 1, Q54] Using the provided information in the following paper chromatogram: Fig: Paper chromatography for compounds A and B. The calculated RfR_f value of A _____ ×10−1\times 10^{-1}.
Not attempted
ABSolvent frontBase lineSpot5 cm2 cm2 cm
Your answer: —
Correct answer: 4
708
[JEE Main 2021, 25 February Shift 1, Q44] The correct statement about B2H6\mathrm{B_2H_6} is
Not attempted
A
All B−H−B\mathrm{B-H-B} angles are of 120∘120^\circ
B
Its fragment, BH3\mathrm{BH_3}, behaves as a Lewis base
C
The two B−H−B\mathrm{B-H-B} bonds are not of same length
D
Terminal B−H\mathrm{B-H} bonds have less pp-character when compared to bridging bonds
709
[JEE Main 2021, 25 February Shift 1, Q59] Among the following, the number of halide(s) which is/are inert to hydrolysis is _____. (a) BF3\mathrm{BF_3} (b) SiCl4\mathrm{SiCl_4} (c) PCl5\mathrm{PCl_5} (d) SF6\mathrm{SF_6}
Not attempted
Your answer: —
Correct answer: 1
710
[JEE Main 2021, 25 February Shift 1, Q45] Which of the following equation depicts the oxidizing nature of H2O2\mathrm{H_2O_2}?
Not attempted
A
2I−+H2O2+2H+→I2+2H2O\mathrm{2I^- + H_2O_2 + 2H^+ \rightarrow I_2 + 2H_2O}
B
Cl2+H2O2→2HCl+O2\mathrm{Cl_2 + H_2O_2 \rightarrow 2HCl + O_2}
C
KIO4+H2O2→KIO3+H2O+O2\mathrm{KIO_4 + H_2O_2 \rightarrow KIO_3 + H_2O + O_2}
D
I2+H2O2+2OH−→2I−+2H2O+O2\mathrm{I_2 + H_2O_2 + 2OH^- \rightarrow 2I^- + 2H_2O + O_2}
711
[JEE Main 2021, 25 February Shift 1, Q51] In basic medium CrO42−\mathrm{CrO_4^{2-}} oxidises S2O32−\mathrm{S_2O_3^{2-}} to form SO42−\mathrm{SO_4^{2-}} and itself changes into Cr(OH)4−\mathrm{Cr(OH)_4^{-}}. The volume of 0.1540.154 M CrO42−\mathrm{CrO_4^{2-}} required to react with 4040 mL of 0.250.25 M S2O32−\mathrm{S_2O_3^{2-}} is _____ mL. (Rounded-off to the nearest integer)
Not attempted
Your answer: —
Correct answer: 173
712
[JEE Main 2021, 25 February Shift 1, Q43] The solubility of AgCN\mathrm{AgCN} in a buffer solution of pH=3\mathrm{pH} = 3 is xx. The value of xx is: [Assume: No cyano complex is formed; Ksp(AgCN)=2.2×10−16K_{sp}(\mathrm{AgCN}) = 2.2 \times 10^{-16} and Ka(HCN)=6.2×10−10K_a(\mathrm{HCN}) = 6.2 \times 10^{-10}]
Not attempted
A
1.9×10−51.9 \times 10^{-5}
B
2.2×10−162.2 \times 10^{-16}
C
1.6×10−61.6 \times 10^{-6}
D
0.625×10−60.625 \times 10^{-6}
713
[JEE Main 2021, 25 February Shift 1, Q60] The reaction of cyanamide, NH2CN(s)\mathrm{NH_2CN_{(s)}} with oxygen was run in a bomb calorimeter and ΔU\Delta U was found to be −742.24-742.24 kJ mol−1^{-1}. The magnitude of ΔH298\Delta H_{298} for the reaction NH2CN(s)+32O2(g)→N2(g)+CO2(g)+H2O(l)\mathrm{NH_2CN_{(s)} + \tfrac{3}{2}O_{2(g)} \rightarrow N_{2(g)} + CO_{2(g)} + H_2O_{(l)}} is _____ kJ. (Rounded off to the nearest integer) [Assume ideal gases and R=8.314R = 8.314 J mol−1^{-1} K−1^{-1}]
Not attempted
Your answer: —
Correct answer: 741
714
[JEE Main 2021, 25 February Shift 1, Q53] A car tyre is filled with nitrogen gas at 3535 psi at 27∘C27^\circ\mathrm{C}. It will burst if pressure exceeds 4040 psi. The temperature in ∘C^\circ\mathrm{C} at which the car tyre will burst is _____. (Rounded-off to the nearest integer)
Not attempted
Your answer: —
Correct answer: 70
715
[JEE Main 2021, 25 February Shift 1, Q40] According to molecular orbital theory, the species among the following that does not exist is
Not attempted
A
He2+\mathrm{He_2^{+}}
B
Be2\mathrm{Be_2}
C
O22−\mathrm{O_2^{2-}}
D
He2−\mathrm{He_2^{-}}
716
[JEE Main 2021, 25 February Shift 1, Q55] The ionization enthalpy of Na+\mathrm{Na^+} formation from Na(g)\mathrm{Na_{(g)}} is 495.8495.8 kJ mol−1^{-1}, while the electron gain enthalpy of Br\mathrm{Br} is −325.0-325.0 kJ mol−1^{-1}. Given the lattice enthalpy of NaBr\mathrm{NaBr} is −728.4-728.4 kJ mol−1^{-1}. The energy for the formation of NaBr\mathrm{NaBr} ionic solid is (−)(-) _____ ×10−1\times 10^{-1} kJ mol−1^{-1}.
Not attempted
Your answer: —
Correct answer: 5576
717
[JEE Main 2021, 25 February Shift 1, Q47] The plots radial distribution functions for various orbitals of hydrogen atom against rr are given below. The correct plot for 3s3s orbital is
Not attempted
048510r(Å)4πr²R²(A)0123510r(Å)4πr²R²(B)0123510r(Å)4πr²R²(C)00.51.01.52.0510r(Å)4πr²R²(D)
A
(B)
B
(A)
C
(D)
D
(C)
718
[JEE Main 2021, 25 February Shift 1, Q52] 0.40.4 g mixture of NaOH\mathrm{NaOH}, Na2CO3\mathrm{Na_2CO_3} and some inert impurities was first titrated with N10\dfrac{N}{10} HCl\mathrm{HCl} using phenolphthalein as an indicator, 17.517.5 mL of HCl\mathrm{HCl} was required at the end point. After this methyl orange was added and titrated. 1.51.5 mL of same HCl\mathrm{HCl} was required for the next end point. The weight percentage of Na2CO3\mathrm{Na_2CO_3} in the mixture is _____. (Rounded-off to the nearest integer)
Not attempted
Your answer: —
Correct answer: 4
719
[JEE Main 2021, 24 February Shift 2, Q36] Match List - I and List - II. List-IList-II(a) Valium(i) Antifertility drug(b) Morphine(ii) Pernicious anaemia(c) Norethindrone(iii) Analgesic(d) Vitamin B12(iv) Tranquilizer\displaystyle\begin{array}{|l|l|}\hline \textbf{List-I} & \textbf{List-II} \\\hline \text{(a) Valium} & \text{(i) Antifertility drug} \\ \text{(b) Morphine} & \text{(ii) Pernicious anaemia} \\ \text{(c) Norethindrone} & \text{(iii) Analgesic} \\ \text{(d) Vitamin B}_{12} & \text{(iv) Tranquilizer} \\\hline \end{array}
Not attempted
A
(a) - (i); (b) - (iii); (c) - (iv); (d) - (ii)
B
(a) - (iv); (b) - (iii); (c) - (ii); (d) - (i)
C
(a) - (iv); (b) - (iii); (c) - (i); (d) - (ii)
D
(a) - (ii); (b) - (iv); (c) - (iii); (d) - (i)
720
[JEE Main 2021, 24 February Shift 2, Q38] In polymer Buna-S : 'S' stands for :
Not attempted
A
Strength
B
Sulphur
C
Sulphonation
D
Styrene
721
[JEE Main 2021, 24 February Shift 2, Q34] What is the correct sequence of reagents used for converting nitrobenzene into m-dibromobenzene ?
Not attempted
NO2?BrBr
A
→NaNO2 / →HCl / →KBr / →H+\xrightarrow{\mathrm{NaNO_2}}\ /\ \xrightarrow{\mathrm{HCl}}\ /\ \xrightarrow{\mathrm{KBr}}\ /\ \xrightarrow{\mathrm{H^+}}
B
→Br2/Fe / →Sn/HCl / →NaNO2/HCl / →CuBr/HBr\xrightarrow{\mathrm{Br_2/Fe}}\ /\ \xrightarrow{\mathrm{Sn/HCl}}\ /\ \xrightarrow{\mathrm{NaNO_2/HCl}}\ /\ \xrightarrow{\mathrm{CuBr/HBr}}
C
→Sn/HCl / →KBr / →Br2 / →H+\xrightarrow{\mathrm{Sn/HCl}}\ /\ \xrightarrow{\mathrm{KBr}}\ /\ \xrightarrow{\mathrm{Br_2}}\ /\ \xrightarrow{\mathrm{H^+}}
D
→Sn/HCl / →Br2 / →NaNO2 / →NaBr\xrightarrow{\mathrm{Sn/HCl}}\ /\ \xrightarrow{\mathrm{Br_2}}\ /\ \xrightarrow{\mathrm{NaNO_2}}\ /\ \xrightarrow{\mathrm{NaBr}}
722
[JEE Main 2021, 24 February Shift 2, Q44] The diazonium salt of which of the following compounds will form a coloured dye on reaction with β\beta-Naphthol in NaOH ?
Not attempted
A
C6H5−N(CH3)2\mathrm{C_6H_5-N(CH_3)_2} (N,N-dimethylaniline)
B
C6H5−CH2−NH2\mathrm{C_6H_5-CH_2-NH_2} (benzylamine)
C
C6H5−NH2\mathrm{C_6H_5-NH_2} (aniline)
D
C6H5−NH−CH3\mathrm{C_6H_5-NH-CH_3} (N-methylaniline)
723
[JEE Main 2021, 24 February Shift 2, Q52] The total number of amines among the following which can be synthesized by Gabriel synthesis is ______. (A) (CH3)2CH−CH2−NH2\mathrm{(CH_3)_2CH-CH_2-NH_2} (B) CH3CH2NH2\mathrm{CH_3CH_2NH_2} (C) C6H5−CH2−NH2\mathrm{C_6H_5-CH_2-NH_2} (D) C6H5−NH2\mathrm{C_6H_5-NH_2}
Not attempted
Your answer: —
Correct answer: 3
724
[JEE Main 2021, 24 February Shift 2, Q37] Which of the following reagent is suitable for the preparation of the product in the above reaction ?
Not attempted
O?
A
Red P + Cl2+\ \mathrm{Cl_2}
B
NaBH4\mathrm{NaBH_4}
C
NH2−NH2/C2H5O−Na+\mathrm{NH_2-NH_2/C_2H_5O^{-}Na^{+}}
D
Ni/H2\mathrm{Ni/H_2}
725
[JEE Main 2021, 24 February Shift 2, Q45] Match List - I and List - II. List IList II(a) R-COCl→R-CHO(i) Br2/NaOH(b) R-CH2-COOH→R-CH(Cl)-COOH(ii) H2/Pd-BaSO4(c) R-CONH2→R-NH2(iii) Zn(Hg)/Conc. HCl(d) R-CO-CH3→R-CH2-CH3(iv) Cl2/Red P, H2O\displaystyle\begin{array}{|l|l|}\hline \textbf{List I} & \textbf{List II} \\\hline \text{(a) R-COCl} \rightarrow \text{R-CHO} & \text{(i) Br}_2\text{/NaOH} \\ \text{(b) R-CH}_2\text{-COOH} \rightarrow \text{R-CH(Cl)-COOH} & \text{(ii) H}_2\text{/Pd-BaSO}_4 \\ \text{(c) R-CONH}_2 \rightarrow \text{R-NH}_2 & \text{(iii) Zn(Hg)/Conc. HCl} \\ \text{(d) R-CO-CH}_3 \rightarrow \text{R-CH}_2\text{-CH}_3 & \text{(iv) Cl}_2\text{/Red P, H}_2\text{O} \\\hline \end{array} Choose the correct answer from the options given below:
Not attempted
A
(a)-(iii), (b)-(iv), (c)-(i), (d)-(ii)
B
(a)-(ii), (b)-(iv), (c)-(i), (d)-(iii)
C
(a)-(iii), (b)-(i), (c)-(iv), (d)-(ii)
D
(a)-(ii), (b)-(i), (c)-(iv), (d)-(iii)
726
[JEE Main 2021, 24 February Shift 2, Q40] The correct order of the following compounds showing increasing tendency towards nucleophilic substitution reaction is
Not attempted
Cl(i)ClNO2(ii)ClNO2NO2(iii)ClNO2O2NNO2(iv)
A
(i) < (ii) < (iii) < (iv)
B
(iv) < (i) < (ii) < (iii)
C
(iv) < (iii) < (ii) < (i)
D
(iv) < (i) < (iii) < (ii)
727
[JEE Main 2021, 24 February Shift 2, Q42] The incorrect statement among the following is:
Not attempted
A
Red colour of ruby is due to the presence of Co3+\mathrm{Co^{3+}}
B
If the t2gt_{2g} and ege_g orbitals of an octahedral compound are completely filled, it is predicted to be colourless.
C
Secondary valency of a coordination complex is equal to the coordination number
D
Removal of water from [Ti(H2O)6]Cl3[\mathrm{Ti(H_2O)_6}]\mathrm{Cl_3} on heating renders it colourless.
728
[JEE Main 2021, 24 February Shift 2, Q49] The calculated magnetic moments (spin only value) for species [FeCl4]2−[\mathrm{FeCl_4}]^{2-}, [Co(C2O4)3]3−[\mathrm{Co(C_2O_4)_3}]^{3-} and MnO42−\mathrm{MnO_4^{2-}} respectively:
Not attempted
A
4.90, 0 and 1.73 BM
B
5.82, 0 and 0 BM
C
5.92, 4.90 and 0 BM
D
4.90, 0 and 2.83 BM
729
[JEE Main 2021, 24 February Shift 2, Q50] Which is the correct order of the following elements with respect to their density?
Not attempted
A
Cr < Zn < Co < Cu < Fe
B
Zn < Cu < Co < Fe < Cr
C
Zn < Cr < Fe < Co < Cu
D
Cr < Fe < Co < Cu < Zn
730
[JEE Main 2021, 24 February Shift 2, Q32] Match List - I with List - II. List-I (Metal)List-II (Ores)(a) Aluminium(i) Siderite(b) Iron(ii) Calamine(c) Copper(iii) Kaolinite(d) Zinc(iv) Malachite\displaystyle\begin{array}{|l|l|}\hline \textbf{List-I (Metal)} & \textbf{List-II (Ores)} \\\hline \text{(a) Aluminium} & \text{(i) Siderite} \\ \text{(b) Iron} & \text{(ii) Calamine} \\ \text{(c) Copper} & \text{(iii) Kaolinite} \\ \text{(d) Zinc} & \text{(iv) Malachite} \\\hline \end{array} Choose the correct answer from the options given below :
Not attempted
A
(a) - (ii); (b) - (iv); (c) - (i); (d) - (iii)
B
(a) - (iii); (b) - (i); (c) - (iv); (d) - (ii)
C
(a) - (i); (b) - (iii); (c) - (iv); (d) - (ii)
D
(a) - (iv); (b) - (iii); (c) - (ii); (d) - (i)
731
[JEE Main 2021, 24 February Shift 2, Q35] Most suitable salt which can be used for efficient clotting of blood will be
Not attempted
A
FeSO4\mathrm{FeSO_4}
B
NaHCO3\mathrm{NaHCO_3}
C
Mg(HCO3)2\mathrm{Mg(HCO_3)_2}
D
FeCl3\mathrm{FeCl_3}
732
[JEE Main 2021, 24 February Shift 2, Q57] Sucrose hydrolyses in acid solution into glucose and fructose following first order rate law with a half-life of 3.33 h at 25 °C. After 9 h, the fraction of sucrose remaining is ff. The value of log⁡10(1f)\log_{10}\left(\dfrac{1}{f}\right) is ______ ×10−2\times 10^{-2}. (Rounded off to nearest integer) [Assume: ln⁡10=2.303\ln 10 = 2.303, ln⁡2=0.693\ln 2 = 0.693]
Not attempted
Your answer: —
Correct answer: 81
733
[JEE Main 2021, 24 February Shift 2, Q53] The magnitude of the change in oxidising power of the MnO4−/Mn2+\mathrm{MnO_4^-/Mn^{2+}} couple is x×10−4x \times 10^{-4} V, if the H+\mathrm{H^+} concentration is decreased from 1 M to 10−410^{-4} M at 25°C. (Assume concentration of MnO4−\mathrm{MnO_4^-} and Mn2+\mathrm{Mn^{2+}} to be same on change in H+\mathrm{H^+} concentration). The value of xx is (Rounded off to the nearest integer) [Given:2.303RTF=0.059]\left[\text{Given}: \dfrac{2.303RT}{F} = 0.059\right]
Not attempted
Your answer: —
Correct answer: 3776
734
[JEE Main 2021, 24 February Shift 2, Q60] C6H6\mathrm{C_6H_6} freezes at 5.5°C. The temperature at which a solution of 10 g of C4H10\mathrm{C_4H_{10}} in 200 g of C6H6\mathrm{C_6H_6} freeze is ______ °C. (The molal freezing point depression constant of C6H6\mathrm{C_6H_6}, is 5.12∘C/m5.12^\circ\mathrm{C/m})
Not attempted
Your answer: —
Correct answer: 1
735
[JEE Main 2021, 24 February Shift 2, Q39] Given below are two statements: Statement I: The value of the parameter "Biochemical Oxygen Demand (BOD)" is important for survival of aquatic life. Statement II: The optimum value of BOD is 6.5 ppm. In the light of the above statements, choose the most appropriate answer from the options given below
Not attempted
A
Statement I is true but Statement II is false
B
Both Statement I and Statement II are false
C
Statement I is false but Statement II is true
D
Both Statement I and Statement II are true
736
[JEE Main 2021, 24 February Shift 2, Q41] Which one of the following carbonyl compounds cannot be prepared by addition of water on an alkyne in the presence of HgSO4\mathrm{HgSO_4} and H2SO4\mathrm{H_2SO_4} ?
Not attempted
A
CH3−CH2−CHO\mathrm{CH_3-CH_2-CHO} (propanal)
B
CH3−CHO\mathrm{CH_3-CHO} (ethanal)
C
CH3−CO−CH2CH3\mathrm{CH_3-CO-CH_2CH_3} (butan-2-one)
D
C6H11−CO−CH3\mathrm{C_6H_{11}-CO-CH_3} (cyclohexyl methyl ketone, acetylcyclohexane)
737
[JEE Main 2021, 24 February Shift 2, Q47] Which one of the following compounds is non-aromatic?
Not attempted
A
Cyclohepta-1,3,5-triene
B
Cyclobutene ring carrying two positive charges (cyclobutenyl dication)
C
Anthracene
D
Furan
O
738
[JEE Main 2021, 24 February Shift 2, Q51] Among the following allotropic forms of sulphur, the number of allotropic forms, which will show paramagnetism is ______. (A) α\alpha-sulphur (B) β\beta-sulphur (C) S2\mathrm{S_2}-form
Not attempted
Your answer: —
Correct answer: 1
739
[JEE Main 2021, 24 February Shift 2, Q46] Match List - I with List - II List-I (Salt)List-II (Flame colour wavelength)(a) LiCl(i) 455.5 nm(b) NaCl(ii) 670.8 nm(c) RbCl(iii) 780.0 nm(d) CsCl(iv) 589.2 nm\displaystyle\begin{array}{|l|l|}\hline \textbf{List-I (Salt)} & \textbf{List-II (Flame colour wavelength)} \\\hline \text{(a) LiCl} & \text{(i) 455.5 nm} \\ \text{(b) NaCl} & \text{(ii) 670.8 nm} \\ \text{(c) RbCl} & \text{(iii) 780.0 nm} \\ \text{(d) CsCl} & \text{(iv) 589.2 nm} \\\hline \end{array} Choose the correct answer from the options given below :
Not attempted
A
(a)-(ii), (b)-(iv), (c)-(iii), (d)-(i)
B
(a)-(iv), (b)-(ii), (c)-(iii), (d)-(i)
C
(a)-(ii), (b)-(i), (c)-(iv), (d)-(iii)
D
(a)-(i), (b)-(iv), (c)-(ii), (d)-(iii)
740
[JEE Main 2021, 24 February Shift 2, Q31] Given below are two statements: one is labelled as Assertion A and the other is labelled as Reason R. Assertion A: Hydrogen is the most abundant element in the Universe, but it is not the most abundant gas in the troposphere. Reason R: Hydrogen is the lightest element. In the light of the above statements, choose the correct answer from the options given below:
Not attempted
A
Both A and R are true and R is the correct explanation of A
B
Both A and R are true but R is NOT the correct explanation of A
C
A is false but R is true
D
A is true but R is false
741
[JEE Main 2021, 24 February Shift 2, Q58] The solubility product of PbI2\mathrm{PbI_2} is 8.0×10−98.0\times 10^{-9}. The solubility of lead iodide in 0.1 molar solution of lead nitrate is x×10−6x\times 10^{-6} mol/L. The value of xx is ______. (Rounded off to the nearest integer) [Given 2=1.41\sqrt{2} = 1.41]
Not attempted
Your answer: —
Correct answer: 141
742
[JEE Main 2021, 24 February Shift 2, Q59] Assuming ideal behaviour, the magnitude of log⁡K\log K for the following reaction at 25°C is x×10−1x\times 10^{-1}. The value of xx is ______ (Integer answer) 3 HC≡CH(g)⇌C6H6(l)3\,\mathrm{HC{\equiv}CH_{(g)}} \rightleftharpoons \mathrm{C_6H_{6(l)}} [Given: ΔfG∘(HC≡CH)=−2.04×105 J mol−1\Delta_fG^\circ(\mathrm{HC{\equiv}CH}) = -2.04\times 10^{5}\ \mathrm{J\ mol^{-1}}; ΔfG∘(C6H6)=−1.24×105 J mol−1\Delta_fG^\circ(\mathrm{C_6H_6}) = -1.24\times 10^{5}\ \mathrm{J\ mol^{-1}}; R=8.314 J K−1 mol−1R = 8.314\ \mathrm{J\ K^{-1}\ mol^{-1}}]
Not attempted
Your answer: —
Correct answer: 855
743
[JEE Main 2021, 24 February Shift 2, Q54] The volume occupied by 4.75 g of acetylene gas at 50 °C and 740 mmHg pressure is ______ L (Rounded off to the nearest integer) [Given R=0.082 L atm K−1 mol−1R = 0.082\ \mathrm{L\ atm\ K^{-1}\ mol^{-1}}]
Not attempted
Your answer: —
Correct answer: 5
744
[JEE Main 2021, 24 February Shift 2, Q43] The correct set from the following in which both pairs are in correct order of melting point is
Not attempted
A
LiF>LiCl\mathrm{LiF} > \mathrm{LiCl} ; NaCl>MgO\mathrm{NaCl} > \mathrm{MgO}
B
LiCl>LiF\mathrm{LiCl} > \mathrm{LiF} ; NaCl>MgO\mathrm{NaCl} > \mathrm{MgO}
C
LiCl>LiF\mathrm{LiCl} > \mathrm{LiF} ; MgO>NaCl\mathrm{MgO} > \mathrm{NaCl}
D
LiF>LiCl\mathrm{LiF} > \mathrm{LiCl} ; MgO>NaCl\mathrm{MgO} > \mathrm{NaCl}
745
[JEE Main 2021, 24 February Shift 2, Q48] The correct shape and I-I-I bond angles respectively in I3−\mathrm{I_3^-} ion are :
Not attempted
A
Distorted trigonal planar 135° and 90°
B
T-shaped; 180° and 90°
C
Trigonal planar; 120°
D
Linear; 180°
746
[JEE Main 2021, 24 February Shift 2, Q33] According to Bohr's atomic theory (A) Kinetic energy of electron is ∝Z2n2\propto \dfrac{Z^2}{n^2} (B) The product of velocity (vv) of electron and principal quantum number (nn), 'vnvn' ∝Z2\propto Z^2 (C) Frequency of revolution of electron in an orbit is ∝Z3n3\propto \dfrac{Z^3}{n^3}. (D) Coulombic force of attraction on the electron is ∝Z3n4\propto \dfrac{Z^3}{n^4}. Choose the most appropriate answer from the options given below
Not attempted
A
(A) only
B
(C) only
C
(A), (C) and (D) only
D
(A) and (D) only
747
[JEE Main 2021, 24 February Shift 2, Q55] The formula of a gaseous hydrocarbon which requires 6 times of its own volume of O2\mathrm{O_2} for complete oxidation and produces 4 times its own volume of CO2\mathrm{CO_2} is CxHy\mathrm{C_xH_y}. The value of yy is ______.
Not attempted
Your answer: —
Correct answer: 8
748
[JEE Main 2021, 24 February Shift 2, Q56] 1.86 g of aniline completely reacts to form acetanilide. 10% of the product is lost during purification. Amount of acetanilide obtained after purification (in g) is ______ ×10−2\times 10^{-2}.
Not attempted
Your answer: —
Correct answer: 243
749
[JEE Main 2021, 24 February Shift 1, Q30] The coordination number of an atom in a body-centered cubic structure is ________. [Assume that the lattice is made up of atoms.]
Not attempted
Your answer: —
Correct answer: 8
750
[JEE Main 2021, 24 February Shift 1, Q28] The gas released during anaerobic degradation of vegetation may lead to :
Not attempted
A
Ozone hole
B
Acid rain
C
Corrosion of metals
D
Global warming and cancer
751
[JEE Main 2021, 24 February Shift 1, Q27] Match List I with List II. List I (Monomer Unit)List II (Polymer)(a)Caprolactam(i)Natural rubber(b)2-Chloro-1,3-butadiene(ii)Buna-N(c)Isoprene(iii)Nylon 6(d)Acrylonitrile(iv)Neoprene\displaystyle\begin{array}{|l|l|l|l|}\hline & \text{List I (Monomer Unit)} & & \text{List II (Polymer)} \\ \hline \text{(a)} & \text{Caprolactam} & \text{(i)} & \text{Natural rubber} \\ \text{(b)} & \text{2-Chloro-1,3-butadiene} & \text{(ii)} & \text{Buna-N} \\ \text{(c)} & \text{Isoprene} & \text{(iii)} & \text{Nylon 6} \\ \text{(d)} & \text{Acrylonitrile} & \text{(iv)} & \text{Neoprene} \\ \hline \end{array} Choose the correct answer from the options given below :
Not attempted
A
(a) →\rightarrow (iv), (b) →\rightarrow (iii), (c) →\rightarrow (ii), (d) →\rightarrow (i)
B
(a) →\rightarrow (ii), (b) →\rightarrow (i), (c) →\rightarrow (iv), (d) →\rightarrow (iii)
C
(a) →\rightarrow (iii), (b) →\rightarrow (iv), (c) →\rightarrow (i), (d) →\rightarrow (ii)
D
(a) →\rightarrow (i), (b) →\rightarrow (ii), (c) →\rightarrow (iii), (d) →\rightarrow (iv)
752
[JEE Main 2021, 24 February Shift 1, Q26] (A) HOCl+H2O2→H3O++Cl−+O2\text{(A)}\ \mathrm{HOCl + H_2O_2 \rightarrow H_3O^+ + Cl^- + O_2} (B) I2+H2O2+2OH−→2I−+2H2O+O2\text{(B)}\ \mathrm{I_2 + H_2O_2 + 2OH^- \rightarrow 2I^- + 2H_2O + O_2} Choose the correct option.
Not attempted
A
H2O2\mathrm{H_2O_2} acts as reducing and oxidising agent respectively in equation (A) and (B)
B
H2O2\mathrm{H_2O_2} acts as oxidising agent in equation (A) and (B)
C
H2O2\mathrm{H_2O_2} acts as reducing agent in equation (A) and (B)
D
H2O2\mathrm{H_2O_2} act as oxidizing and reducing agent respectively in equation (A) and (B)
753
[JEE Main 2021, 24 February Shift 1, Q25] In Freundlich adsorption isotherm, slope of AB line is :
Not attempted
ABlog Plog (x/m)
A
log⁡n\log n with (n>1)(n>1)
B
nn with (n, 0.1 to 0.5)(n,\ 0.1\ \text{to}\ 0.5)
C
log⁡1n\log\dfrac{1}{n} with (n<1)(n<1)
D
1n\dfrac{1}{n} with (1n=0 to 1)\left(\dfrac{1}{n} = 0\ \text{to}\ 1\right)
754
[JEE Main 2021, 24 February Shift 1, Q23] Which of the following ore is concentrated using group 1 cyanide salt ?
Not attempted
A
Sphalerite
B
Calamine
C
Siderite
D
Malachite
755
[JEE Main 2021, 24 February Shift 1, Q24] Al2O3\mathrm{Al_2O_3} was leached with alkali to get X\mathrm{X}. The solution of X\mathrm{X} on passing of gas Y\mathrm{Y}, forms Z\mathrm{Z}. X\mathrm{X}, Y\mathrm{Y} and Z\mathrm{Z} respectively are :
Not attempted
A
X=Na[Al(OH)4], Y=SO2, Z=Al2O3\mathrm{X = Na[Al(OH)_4],\ Y = SO_2,\ Z = Al_2O_3}
B
X=Na[Al(OH)4], Y=CO2, Z=Al2O3⋅xH2O\mathrm{X = Na[Al(OH)_4],\ Y = CO_2,\ Z = Al_2O_3 \cdot xH_2O}
C
X=Al(OH)3, Y=CO2, Z=Al2O3\mathrm{X = Al(OH)_3,\ Y = CO_2,\ Z = Al_2O_3}
D
X=Al(OH)3, Y=SO2, Z=Al2O3⋅xH2O\mathrm{X = Al(OH)_3,\ Y = SO_2,\ Z = Al_2O_3 \cdot xH_2O}
756
[JEE Main 2021, 24 February Shift 1, Q29] The major components in "Gun Metal" are :
Not attempted
A
Cu, Zn and Ni
B
Cu, Sn and Zn
C
Al, Cu, Mg and Mn
D
Cu, Ni and Fe
757
[JEE Main 2021, 24 February Shift 1, Q18] When 9.45 g of ClCH2COOH\mathrm{ClCH_2COOH} is added to 500 mL of water, its freezing point drops by 0.5∘C0.5^\circ\mathrm{C}. The dissociation constant of ClCH2COOH\mathrm{ClCH_2COOH} is x×10−3x \times 10^{-3}. The value of xx is ________. (Rounded off to the nearest integer) [Kf(H2O)=1.86 K kg mol−1][K_{f(\mathrm{H_2O})} = 1.86\ \mathrm{K\ kg\ mol^{-1}}]
Not attempted
Your answer: —
Correct answer: 36
758
[JEE Main 2021, 24 February Shift 1, Q5] Out of the following, which type of interaction is reponsible for the stabilisation of α\alpha -helix structure of proteins ?
Not attempted
A
Covalent bonding
B
vander Waals forces
C
Ionic bonding
D
Hydrogen bonding
759
[JEE Main 2021, 24 February Shift 1, Q8] In the following reaction the reason why meta-nitro product also formed is :
Not attempted
A
– NH2\mathrm{NH}_{2} group is highly meta-directive
B
– NO2\mathrm{NO}_{2} substitution always takes place at meta-position
C
Formation of anilinium ion
D
low temperature
760
[JEE Main 2021, 24 February Shift 1, Q10] 'A' and 'B' in the following reactions are :
Not attempted
A
(A)
B
(B)
C
(C)
D
(D)
761
[JEE Main 2021, 24 February Shift 1, Q6] Which of the following compound gives pink colour on reaction with phthalic anhydride in conc. H2SO4\mathrm{H}_{2}\mathrm{SO}_{4} followed by treatment with NaOH ?
Not attempted
A
(A)
B
(B)
C
(C)
D
(D)
762
[JEE Main 2021, 24 February Shift 1, Q11] Identify products A and B.
Not attempted
A
(A)
B
(B)
C
(C)
D
(D)
763
[JEE Main 2021, 24 February Shift 1, Q12] What is the final product (major) 'A' in the given reaction ?
Not attempted
A
(A)
B
(B)
C
(C)
D
(D)
764
[JEE Main 2021, 24 February Shift 1, Q13] The product formed in the first step of the reaction of with excess Mg/Et2O\mathrm{Mg}/{\mathrm{Et}}_2O ( Et=C2H5\mathrm{Et}=C_2H_5 ) is
Not attempted
A
(A)
B
(B)
C
(C)
D
(D)
765
[JEE Main 2021, 24 February Shift 1, Q15] The stepwise formation of [Cu(NH3)4]2+{[Cu{(NH_3)}_4]}^{2+} is given below: The value of stability constants K1\mathrm{K}_{1} , K2\mathrm{K}_{2} , K3\mathrm{K}_{3} and K4\mathrm{K}_{4} are 104\mathrm{10}^{4} , 1.58 x 103\mathrm{10}^{3} , 5 x 102\mathrm{10}^{2} and 102\mathrm{10}^{2} respectively. The overall equilibrium constants for dissociation of [Cu(NH3)4]2+{[Cu{(NH_3)}_4]}^{2+} is x ×\times 10−12\mathrm{10}^{-12} . The value of x is ________. (Rounded off to the nearest integer)
Not attempted
Your answer: —
Correct answer: 1
766
[JEE Main 2021, 24 February Shift 1, Q1] The electrode potential of M2+\mathrm{M}^{2+} /M of 3d-series elements shows positive value for :
Not attempted
A
Zn
B
Fe
C
Cu
D
Co
767
[JEE Main 2021, 24 February Shift 1, Q22] Gaseous cyclobutene isomerises to butadiene in a first order process which has a 'k' value of 3.3 ×\times 10−4\mathrm{10}^{-4} s−1\mathrm{s}^{-1} at 153°C. The time in minutes it takes for the isomerization to proceed 40% to completion at this temperature is ______. (Rounded off to the nearest integer)
Not attempted
Your answer: —
Correct answer: 26
768
[JEE Main 2021, 24 February Shift 1, Q2] Which of the following reagent is used for the following reaction ? CH3CH2CH3⟶?CH3CH2CHO{\mathrm{CH}}_3{\mathrm{CH}}_2{\mathrm{CH}}_3\overset{?}{\longrightarrow }{\mathrm{CH}}_3{\mathrm{CH}}_2\mathrm{CHO}
Not attempted
A
Molybdenum oxide
B
Manganese acetate
C
Copper at high temperature and pressure
D
Potassium permanganate
769
[JEE Main 2021, 24 February Shift 1, Q9] What is the major product formed by HI on reaction with
Not attempted
A
(A)
B
(B)
C
(C)
D
(D)
770
[JEE Main 2021, 24 February Shift 1, Q7] Given below are two statements : Statement I : Colourless cupric metaborate is reduced to cuprous metaborate in a luminous flame. Statement II : Cuprous metaborate is obtained by heating boric anhydride and copper sulphate in a non-luminous flame. In the light of the above statements, choose the most appropriate answer from the options given below.
Not attempted
A
Statement I is true but Statement II is false
B
Statement I is false but Statement II is true
C
Both Statement I and Statement II are false
D
Both Statement I and Statement II are true
771
[JEE Main 2021, 24 February Shift 1, Q14] Number of amphoteric compounds among the following is ________. (A) BeO (B) BaO (C) Be(OH)2\mathrm{Be(OH)}_{2} (D) Sr(OH)2\mathrm{Sr(OH)}_{2}
Not attempted
Your answer: —
Correct answer: 2
772
[JEE Main 2021, 24 February Shift 1, Q20] The reaction of sulphur in alkaline medium is given below: The values of 'a' is _______. (Integer answer)
Not attempted
Your answer: —
Correct answer: 12
773
[JEE Main 2021, 24 February Shift 1, Q17] At 1990 K and 1 atm pressure, there are equal number of Cl2\mathrm{Cl}_{2} , molecules and Cl atoms in the reaction mixture. The value of Kp\mathrm{K}_{p} for the reaction Cl2(g)\mathrm{Cl}_{2(g)} ⇌\rightleftharpoons 2Cl(g)\mathrm{2Cl}_{(g)} under the above conditions is x ×\times 10−1\mathrm{10}^{-1} . The value of x is _______. (Rounded off to the nearest integer)
Not attempted
Your answer: —
Correct answer: 5
774
[JEE Main 2021, 24 February Shift 1, Q21] For the reaction A(g)\mathrm{A}_{(g)} →\to B(g)\mathrm{B}_{(g)} the value of the equilibrium constant at 300 K and 1 atm is equal to 100.0. The value of Δ\Delta rG{}_{r}\mathrm{G} for the reaction at 300 K and 1 atm in J mol−1\mathrm{mol}^{-1} is – xR, where x is _______. (Rounded off to the nearest integer) [R = 8.31 J mol−1K−1\mathrm{mol}^{-1}\mathrm{K}^{-1} and ln 10 = 2.3)
Not attempted
Your answer: —
Correct answer: 1380
775
[JEE Main 2021, 24 February Shift 1, Q3] Which of the following are isostructural pairs ? A. SO42−SO_4^{2-} and CrO42−CrO_4^{2-} B. SiCl4\mathrm{SiCl}_{4} , and TiCl4\mathrm{TiCl}_{4} C. NH3\mathrm{NH}_{3} and NO3−\mathrm{NO}_{3}^{-} D. BCl3\mathrm{BCl}_{3} and BrCl3\mathrm{BrCl}_{3}
Not attempted
A
B and C only
B
C and D only
C
A and B only
D
A and C only
776
[JEE Main 2021, 24 February Shift 1, Q4] Consider the elements Mg, Al, S, P and Si, the correct increasing order of their first ionization enthalpy is :
Not attempted
A
Al < Mg < Si < S < P
B
Al < Mg < S < Si < P
C
Mg < Al < Si < S < P
D
Mg < Al < Si < P < S
777
[JEE Main 2021, 24 February Shift 1, Q19] 4.5 g of compound A (MW = 90) was used to make 250 mL of its aqueous solution. The molarity of the solution in M is x ×\times 10−1\mathrm{10}^{-1} . The value of x is _______. (Rounded off to the nearest integer)
Not attempted
Your answer: —
Correct answer: 2
n = 4.5/90 = 0.05 mol.
Deconstruction\textbf{Deconstruction}: M = 0.05/0.25. Strategy\textbf{Strategy}: Compute. Execution\textbf{Execution}: 0.2 M = 2 × 10⁻¹. Verification\textbf{Verification}: ✓\checkmark Final Answer\textbf{Final Answer}: 2