JEE MAIN - Chemistry (2022 - 27th July Evening Shift)

1

The correct decreasing order of energy for the orbitals having, following set of quantum numbers :

(A) n = 3, l = 0, m = 0

(B) n = 4, l = 0, m = 0

(C) n = 3, l = 1, m = 0

(D) n = 3, l = 2, m = 1

is :

Answer
(A)
(D) > (B) > (C) > (A)
2

Match List - I with List - II.

List - I List - II
(A) $$\psi_{\mathrm{MO}}=\psi_{\mathrm{A}}-\psi_{\mathrm{B}}$$ (I) Dipole moment
(B) $$\mu=Q \times r$$ (II) Bonding molecular orbital
(C) $$\frac{\mathrm{N}_{\mathrm{b}}-\mathrm{N}_{\mathrm{a}}}{2}$$ (III) Anti-bonding molecular orbital
(D) $$\psi_{\mathrm{MO}}=\psi_{\mathrm{A}}+\psi_{\mathrm{B}}$$ (IV) Bond order

Choose the correct answer from the options given below :

Answer
(C)
$$(\mathrm{A})-(\mathrm{III}),(\mathrm{B})-(\mathrm{I}),(\mathrm{C})-(\mathrm{IV}),(\mathrm{D})-(\mathrm{II})$$
3
The plot of $$\mathrm{pH}$$-metric titration of weak base $$\mathrm{NH}_{4} \mathrm{OH}$$ vs strong acid HCl looks like :
Answer
(A)
JEE Main 2022 (Online) 27th July Evening Shift Chemistry - Ionic Equilibrium Question 37 English Option 1
4

Given below are two statements :

Statement I : For KI, molar conductivity increases steeply with dilution

Statement II : For carbonic acid, molar conductivity increases slowly with dilution

In the light of the above statements, choose the correct answer from the options given below :

Answer
(B)
Both Statement I and Statement II are false
5

Outermost electronic configurations of four elements A, B, C, D are given below :

(A) $$3 s^{2}$$

(B) $$3 s^{2} 3 p^{1}$$

(C) $$3 s^{2} 3 p^{3}$$

(D) $$3 s^{2} 3 p^{4}$$

The correct order of first ionization enthalpy for them is :

Answer
(B)
(B) < (A) < (D) < (C)
6
In neutral or alkaline solution, $$\mathrm{MnO}_{4}^{-}$$ oxidises thiosulphate to :
Answer
(D)
$$\mathrm{SO}_{4}^{2-}$$
7
Low oxidation state of metals in their complexes are common when ligands :
Answer
(A)
have good $$\pi$$-accepting character
8

The structure of A in the given reaction is :

JEE Main 2022 (Online) 27th July Evening Shift Chemistry - Aldehydes, Ketones and Carboxylic Acids Question 80 English

Answer
(C)
JEE Main 2022 (Online) 27th July Evening Shift Chemistry - Aldehydes, Ketones and Carboxylic Acids Question 80 English Option 3
9

Major product '$$\mathrm{B}$$' of the following reaction sequence is :

JEE Main 2022 (Online) 27th July Evening Shift Chemistry - Haloalkanes and Haloarenes Question 60 English

Answer
(B)
JEE Main 2022 (Online) 27th July Evening Shift Chemistry - Haloalkanes and Haloarenes Question 60 English Option 2
10

Match List - I with List - II.

List - I List - II
(A) JEE Main 2022 (Online) 27th July Evening Shift Chemistry - Aldehydes, Ketones and Carboxylic Acids Question 82 English 1 (I) Gatterman Koch reaction
(B) $$C{H_3} - CN\mathrel{\mathop{\kern0pt\longrightarrow}
\limits_{{H_3}{O^ + }}^{SnC{l_2}/HCl}} C{H_3} - CHO$$
(II) Etard reaction
(C) JEE Main 2022 (Online) 27th July Evening Shift Chemistry - Aldehydes, Ketones and Carboxylic Acids Question 82 English 2 (III) Stephen reaction
(D) JEE Main 2022 (Online) 27th July Evening Shift Chemistry - Aldehydes, Ketones and Carboxylic Acids Question 82 English 3 (IV) Rosenmund reaction

Choose the correct answer from the options given below :

Answer
(A)
$$(\mathrm{A})-(\mathrm{IV}),(\mathrm{B})-(\mathrm{III}),(\mathrm{C})-(\mathrm{II}),(\mathrm{D})-(\mathrm{I})$$
11
An organic compound $$'\mathrm{A}'$$ contains nitrogen and chlorine. It dissolves readily in water to give a solution that turns litmus red. Titration of compound $$'\mathrm{A}'$$ with standard base indicates that the molecular weight of $$'\mathrm{A}'$$ is $$131 \pm 2$$. When a sample of $$'\mathrm{A}'$$ is treated with aq. $$\mathrm{NaOH}$$, a liquid separates which contains $$\mathrm{N}$$ but not $$\mathrm{Cl}$$. Treatment of the obtained liquid with nitrous acid followed by phenol gives orange precipitate. The compound $$'\mathrm{A}'$$ is :
Answer
(D)
JEE Main 2022 (Online) 27th July Evening Shift Chemistry - Compounds Containing Nitrogen Question 81 English Option 4
12

Match List - I with Match List - II.

List - I List - II
(A) Glucose + HI (I) Gluconic acid
(B) Glucose + Br$$_2$$ water (II) Glucose pentacetate
(C) Glucose + acetic anhydride (III) Saccharic acid
(D) Glucose + HNO$$_3$$ (IV) Hexane

Choose the correct answer from the options given below:

Answer
(A)
(A) - (IV), (B) - (I), (C) -(II), (D) - (III)
13

Match List - I with List - II.

List - I
(Mixture)
List - II
(Purification Process)
(A) Chloroform & Aniline (I) Steam distillation
(B) Benzoic acid & Napthalene (II) Sublimation
(C) Water & Aniline (III) Distillation
(D) Napthalene & Sodium chloride (IV) Crystallisation

Choose the correct answer from the options given below :

Answer
(D)
(A) - (III), (B) - (IV), (C) - (I), (D) - (II)
14
$$\mathrm{Fe}^{3+}$$ cation gives a prussian blue precipitate on addition of potassium ferrocyanide solution due to the formation of :
Answer
(D)
$$\mathrm{Fe}_{4}\left[\mathrm{Fe}(\mathrm{CN})_{6}\right]_{3}$$
15
The normality of $$\mathrm{H}_{2} \mathrm{SO}_{4}$$ in the solution obtained on mixing $$100 \mathrm{~mL}$$ of $$0.1 \,\mathrm{M} \,\mathrm{H}_{2} \mathrm{SO}_{4}$$ with $$50 \mathrm{~mL}$$ of $$0.1 \,\mathrm{M}\, \mathrm{NaOH}$$ is _______________ $$\times 10^{-1} \mathrm{~N}$$. (Nearest Integer)
Answer
1
16
A gas (Molar mass = 280 $$\mathrm{~g} \mathrm{~mol}^{-1}$$) was burnt in excess $$\mathrm{O}_{2}$$ in a constant volume calorimeter and during combustion the temperature of calorimeter increased from $$298.0 \mathrm{~K}$$ to $$298.45$$ $$\mathrm{K}$$. If the heat capacity of calorimeter is $$2.5 \mathrm{~kJ} \mathrm{~K}^{-1}$$ and enthalpy of combustion of gas is $$9 \mathrm{~kJ} \mathrm{~mol}^{-1}$$ then amount of gas burnt is _____________ g. (Nearest Integer)
Answer
35
17
When a certain amount of solid A is dissolved in $$100 \mathrm{~g}$$ of water at $$25^{\circ} \mathrm{C}$$ to make a dilute solution, the vapour pressure of the solution is reduced to one-half of that of pure water. The vapour pressure of pure water is $$23.76 \,\mathrm{mmHg}$$. The number of moles of solute A added is _____________. (Nearest Integer)
Answer
6
18

$$\matrix{ {[A]} & \to & {[B]} \cr {{\mathop{\rm Reactant}\nolimits} } & {} & {{\mathop{\rm Product}\nolimits} } \cr } $$

If formation of compound $$[\mathrm{B}]$$ follows the first order of kinetics and after 70 minutes the concentration of $$[\mathrm{A}]$$ was found to be half of its initial concentration. Then the rate constant of the reaction is $$x \times 10^{-6} \mathrm{~s}^{-1}$$. The value of $$x$$ is ______________. (Nearest Integer)

Answer
165
19

The number of molecule(s) or ion(s) from the following having non-planar structure is ____________.

$$\mathrm{NO}_{3}^{-}, \mathrm{H}_{2} \mathrm{O}_{2}, \mathrm{BF}_{3}, \mathrm{PCl}_{3}, \mathrm{XeF}_{4}, \mathrm{SF}_{4}, \mathrm{XeO}_{3}, \mathrm{PH}_{4}^{+}, \mathrm{SO}_{3},\left[\mathrm{Al}(\mathrm{OH})_{4}\right]^{-}$$

Answer
6
20
The spin only magnetic moment of the complex present in Fehling's reagent is __________ B.M. (Nearest integer).
Answer
2
21

JEE Main 2022 (Online) 27th July Evening Shift Chemistry - Practical Organic Chemistry Question 32 English

In the above reaction, $$5 \mathrm{~g}$$ of toluene is converted into benzaldehyde with $$92 \%$$ yield. The amount of benzaldehyde produced is ______________ $$\times 10^{-2} \mathrm{~g}$$. (Nearest integer)

Answer
530