JEE MAIN - Chemistry (2022 - 25th July Evening Shift)

1

Match List I with List II:

List I
(molecule)
List II
(hybridization ; shape)
(A) XeO$$_3$$ (I) sp$$^3$$d ; linear
(B) XeF$$_2$$ (II) sp$$^3$$ ; pyramidal
(C) XeOF$$_4$$ (III) sp$$^3$$d$$^3$$ ; distorted octahedral
(D) XeF$$_6$$ (IV) sp$$^3$$d$$^2$$ ; square pyramidal

Choose the correct answer from the options given below:

Answer
(A)
A-II, B-I, C-IV, D-III
2
Two solutions A and B are prepared by dissolving 1 g of non-volatile solutes X and Y, respectively in 1 kg of water. The ratio of depression in freezing points for A and B is found to be 1 : 4. The ratio of molar masses of X and Y is
Answer
(B)
1 : 0.25
3

$${K_{{a_1}}}$$, $${K_{{a_2}}}$$ and $${K_{{a_3}}}$$ are the respective ionization constants for the following reactions (a), (b) and (c).

(a) $${H_2}{C_2}{O_4} \mathbin{\lower.3ex\hbox{$\buildrel\textstyle\rightarrow\over {\smash{\leftarrow}\vphantom{_{\vbox to.5ex{\vss}}}}$}} {H^ + } + H{C_2}O_4^ - $$

(b) $$H{C_2}O_4^ - \mathbin{\lower.3ex\hbox{$\buildrel\textstyle\rightarrow\over {\smash{\leftarrow}\vphantom{_{\vbox to.5ex{\vss}}}}$}} {H^ + } + {C_2}O_4^{2 - }$$

(c) $${H_2}{C_2}O_4^{} \mathbin{\lower.3ex\hbox{$\buildrel\textstyle\rightarrow\over {\smash{\leftarrow}\vphantom{_{\vbox to.5ex{\vss}}}}$}} 2{H^ + } + {C_2}O_4^{2 - }$$

The relationship between $${K_{{a_1}}}$$, $${K_{{a_2}}}$$ and $${K_{{a_3}}}$$ is given as :

Answer
(D)
$${K_{{a_3}}}$$ $$=$$ $${K_{{a_1}}}$$ $$\times$$ $${K_{{a_2}}}$$
4
The molar conductivity of a conductivity cell filled with 10 moles of 20 mL NaCl solution is $${\Lambda _{m1}}$$ and that of 20 moles another identical cell heaving 80 mL NaCl solution is $${\Lambda _{m2}}$$. The conductivities exhibited by these two cells are same. The relationship between $${\Lambda _{m2}}$$ and $${\Lambda _{m1}}$$ is
Answer
(A)
$${\Lambda _{m2}}$$ = 2$${\Lambda _{m1}}$$
5
The first ionization enthalpies of Be, B, N and O follow the order
Answer
(D)
B < Be < O < N
6

The correct order of energy of absorption for the following metal complexes is :

A : [Ni(en)3]2+ , B : [Ni(NH3)6]2+ , C : [Ni(H2O)6]2+

Answer
(A)
C < B < A
7

Match List I with List II:

List I List II
(A) Sulphate (I) Pesticide
(B) Fluoride (II) Bending of bones
(C) Nicotine (III) Laxative effect
(D) Sodium arsinite (IV) Herbicide

Choose the correct answer from the options given below :

Answer
(C)
A-III, B-II, C-I, D-IV
8

Major product of the following reaction is

JEE Main 2022 (Online) 25th July Evening Shift Chemistry - Hydrocarbons Question 57 English

Answer
(D)
JEE Main 2022 (Online) 25th July Evening Shift Chemistry - Hydrocarbons Question 57 English Option 4
9

What is the major product of the following reaction?

JEE Main 2022 (Online) 25th July Evening Shift Chemistry - Aldehydes, Ketones and Carboxylic Acids Question 85 English

Answer
(B)
JEE Main 2022 (Online) 25th July Evening Shift Chemistry - Aldehydes, Ketones and Carboxylic Acids Question 85 English Option 2
10

Arrange the following in decreasing acidic strength.

JEE Main 2022 (Online) 25th July Evening Shift Chemistry - Basics of Organic Chemistry Question 114 English

Answer
(A)
A > B > C > D
11

$$C{H_3} - C{H_2} - CN\mathrel{\mathop{\kern0pt\longrightarrow} \limits_{Ether}^{C{H_3}MgBr}} A\buildrel {{H_3}{O^ + }} \over \longrightarrow B\mathrel{\mathop{\kern0pt\longrightarrow} \limits_{HCl}^{Zn - Hg}} C$$

The correct structure of C is

Answer
(A)
$$C{H_3} - C{H_2} - C{H_2} - C{H_3}$$
12
Glycosidic linkage between C1 of $$\alpha$$-glucose and C2 of $$\beta$$-fructose is found in
Answer
(B)
sucrose
13
In base vs. acid titration, at the end point methyl orange is present as
Answer
(A)
quinonoid form
14
56.0 L of nitrogen gas is mixed with excess hydrogen gas and it is found that 20 L of ammonia gas is produced. The volume of unused nitrogen gas is found to be _________ L.
Answer
46
15
When the excited electron of a H atom from n = 5 drops to the ground state, the maximum number of emission lines observed are _____________.
Answer
10
16

While performing a thermodynamics experiment, a student made the following observations.

HCl + NaOH $$\to$$ NaCl + H2O $$\Delta$$H = $$-$$57.3 kJ mol$$-$$1

CH3COOH + NaOH $$\to$$ CH3COONa + H2O $$\Delta$$H = $$-$$55.3 kJ mol$$-$$1

The enthalpy of ionization of CH3COOH as calculated by the student is _____________ kJ mol$$-$$1. (nearest integer)

Answer
2
17

For the decomposition of azomethane.

CH3N2CH3(g) $$\to$$ CH3CH3(g) + N2(g), a first order reaction, the variation in partial pressure with time at 600 K is given as

JEE Main 2022 (Online) 25th July Evening Shift Chemistry - Chemical Kinetics and Nuclear Chemistry Question 66 English

The half life of the reaction is __________ $$\times$$ 10$$-$$5 s. [Nearest integer]

Answer
2
18
The sum of number of lone pairs of electrons present on the central atoms of XeO3, XeOF4 and XeF6, is ______________
Answer
3
19
The spin-only magnetic moment value of M3+ ion (in gaseous state) from the pairs Cr3+ / Cr2+, Mn3+ / Mn2+, Fe3+ / Fe2+ and Co3+ / Co2+ that has negative standard electrode potential, is ____________ B.M. [Nearest integer]
Answer
4
20
A sample of 4.5 mg of an unknown monohydric alcohol, R-OH was added to methylmagnesium iodide. A gas is evolved and is collected and its volume measured to be 3.1 mL. The molecular weight of the unknown alcohol is __________ g/mol. [Nearest integer]
Answer
33
21
The separation of two coloured substances was done by paper chromatography. The distances travelled by solvent front, substance A and substance B from the base line are 3.25 cm, 2.08 cm and 1.05 cm, respectively. The ratio of Rf values of A to B is _____________.
Answer
2
22
The total number of monobromo derivatives formed by the alkanes with molecular formula C5H12 is (excluding stereo isomers) __________.
Answer
8