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Chemistry

Given below are two statements: One is labelled as Assertion A and the other is labelled as Reason R
Assertion A: Zero orbital overlap is an out of phase overlap
Reason R: It results due to different orientation/direction of approach of orbitals.
In the light of the above statements, choose the correct answer from the options given below

The correct decreasing order of metallic character is:

Given below are two statements: One is labelled as Assertion A and the other is labelled as Reason R.
Assertion A : The reduction of a metal oxide is easier if the metal formed is in liquid state than solid state.
Reason R : The value of \( \Delta G^\ominus \) becomes more on negative side as entropy is higher in liquid state than solid state.
In the light of the above statements, choose the most appropriate answer from the options given below.

The products obtained during treatment of hard water using Clark’s method are”

Statement I: An alloy of lithium and magnesium is used to make aircraft plates.
Statement II: The magnesium ions are important for cell-membrane integrity.
In the light the above statements, choose the correct answer from the options given below:

White phosphorus reacts with thionyl chloride to give.

Concentrated \( \mathrm{HNO_3} \) reacts with Iodine to give:

Which of the following pair is not isoelectronic species? (Atomic number: Sm, \( 62 \); Er, \( 68 \); Yb, \( 70 \); Lu, \( 71 \); Eu, \( 63 \); Tb, \( 65 \); Tm, \( 69 \))

Given below are two statements: One is labelled as Assertion A and the other is labelled as Reason R
Assertion A : Permanganate titrations are not performed in presence of hydrochloric acid.
Reason R : Chlorine is formed as a consequence of oxidation of hydrochloric acid.
In the light of the above statements, choose the correct answer from the options given below.

Match List I with List II.

Choose the correct answer from the options given below:

Dinitrogen and dioxygen, the main constituents of air do not react with each other in atmosphere to form oxides of nitrogen because:

The major product in the given reaction is:

Arrange the following in increasing order of reactivity towards nitration.
(a) p-xylene (b) bromobenzene (c) mesitylene (d) nitrobenzene (e) benzene
Choose the correct answer from the options given below.

Compound \( I \) is heated with Conc. \( \mathrm{HI} \) to give a hydroxy compound \( A \) which is further heated with \( \mathrm{Zn} \) dust to give compound \( B \). Identify \( A \) and \( B \).

Given below are two statements : one is labelled as Assertion A and the other is labelled as Reason R
Assertion A: Aniline on nitration yields ortho, meta & para nitro derivatives of aniline
Reason R : Nitrating mixture is a strong acidic mixture
In the light of the above statements, choose the correct answer from the options given below.

Match List I with List II.

Choose the correct answer from the options given below:

Two statements in respect of drug-enzyme interaction are given below.
Statement I: Action of an enzyme can be blocked only when an inhibitor blocks the active site of the enzyme.
Statement II: An inhibitor can form a strong covalent bond with the enzyme.
In the light of the above statements, choose the correct answer from the options given below:

Given below are two statements: One is labelled as Assertion A and the other is labelled as Reason R.
Assertion A : Thin layer chromatography is an adsorption chromatography.
Reason R : A thin layer of silica gel is spread over a glass plate of suitable size in thin layer chromatography which acts as an adsorbent.
In the light of the above statements, choose the correct answer from the options given below:

The formulas of A and B are the following reaction sequence.

Find out the major product for the above reaction.

\( 2 \, \text{L} \) of \( 0.2 \, \text{M} \) \( \mathrm{H_2SO_4} \) is reacted with \( 2 \, \text{L} \) of \( 0.1 \, \text{M} \) \( \mathrm{NaOH} \) solution, the molarity of the resulting product \( \mathrm{Na_2SO_4} \) in the solution is __________ millimolar. (Nearest integer)

Metal M crystallizes into a fcc lattice with the edge length \( 4.0 \times 10^{-8} \, \text{cm} \). The atomic mass of the metal is ________ \( \text{g/mol} \). (Nearest integer)
(Use: \( N_A = 6.02 \times 10^{23} \, \text{mol}^{-1} \), density of metal, \( M = 9.03 \, \text{g} \, \text{cm}^{-3} \))

If the wavelength for an electron emitted from H-atom is \( 3.3 \times 10^{-10} \, \text{m} \), then energy absorbed by the electron in its ground state compared to minimum energy required for its escape from the atom, is ________ times. (Nearest integer)
[Given: \( h = 6.626 \times 10^{-34} \, \text{J s} \)]
Mass of electron \( = 9.1 \times 10^{-31} \, \text{kg} \)

A gaseous mixture of two substances A and B, under a total pressure of \( 0.8 \, \text{atm} \) is in equilibrium with an ideal liquid solution. The mole fraction of substance A is \( 0.5 \) in the vapour phase and \( 0.2 \) in the liquid phase. The vapour pressure of pure liquid A is __________ \( \text{atm} \). (Nearest integer)

At \( 600 \, \text{K} \), \( 2 \, \text{mol} \) of \( \text{NO} \) are mixed with \( 1 \, \text{mol} \) of \( \text{O}_2 \). The reaction occurring as above comes to equilibrium under a total pressure of \( 1 \, \text{atm} \). Analysis of the system shows that \( 0.6 \, \text{mol} \) of oxygen are present at equilibrium. The equilibrium constant for the reaction is __________. (Nearest integer)

A sample of \( 0.125 \, \text{g} \) of an organic compound when analyzed by Duma’s method yields \( 22.78 \, \text{mL} \) of nitrogen gas collected over KOH solution at \( 280 \, \text{K} \) and \( 759 \, \text{mm Hg} \). The percentage of nitrogen in the given organic compound is ________ . (Nearest integer)
Given: (a) The vapour pressure of water of \( 280 \, \text{K} \) is \( 14.2 \, \text{mm Hg} \).
(b) \( R = 0.082 \, \text{L atm K}^{-1} \text{ mol}^{-1} \)

On reaction with stronger oxidizing agent like \( \text{KIO}_4 \), hydrogen peroxide oxidizes with the evolution of \( \text{O}_2 \). The oxidation number of \( \text{I} \) in \( \text{KIO}_4 \) changes to _______.

For a reaction, given below is the graph of \( \ln k \) vs \( \dfrac{1}{T} \). The activation energy for the reaction is equal to ________ \( \text{cal mol}^{-1} \). (nearest integer)
(Given: \( R = 2 \, \text{cal K}^{-1} \text{ mol}^{-1} \))

Among the following the number of curves not in accordance with Freundlich adsorption isotherm is _______.

Among the following the number of state variables is ____________ .
Internal energy \( (U) \)
Volume \( (V) \)
Heat \( (q) \)
Enthalpy \( (H) \)

JEE Main 2022 28th July Evening shift

Physics Chemistry Mathematics

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The correct decreasing order of metallic character is: