On account of the disruption in education due to the corona pandemic, we're opening up our platform for teachers, free of cost. Know More →

JEE Main

Explore popular questions from Equilibrium for JEE Main. This collection covers Equilibrium previous year JEE Main questions hand picked by experienced teachers.

Select Subject

Physics

Chemistry

Mathematics

Equilibrium

Correct Marks 4

Incorrectly Marks -1

Q 1. The equilibrium constant of a reaction is {tex} 20.0 . {/tex} At equilibrium, the rate constant of forward reaction is {tex} 10.0 . {/tex} The rate constant for backward reaction is

0.5

B

20

C

10

D

200

Explanation

Correct Marks 4

Incorrectly Marks -1

Q 2. At a given temperature, the equilibrium constant for the reactions
{tex} \mathrm { NO } ( \mathrm { g } ) + \frac { 1 } { 2 } \mathrm { O } _ { 2 } ( \mathrm { g } ) \rightleftharpoons \mathrm { NO } _ { 2 } ( \mathrm { g } ) {/tex} and {tex}2 \mathrm { NO } _ { 2 } ( \mathrm { g } ) \rightleftharpoons {/tex} {tex} 2 \mathrm { NO } ( \mathrm { g } ) + \mathrm { O } _ { 2 } ( \mathrm { g } ) {/tex} are {tex}\mathrm K _ { 1 } {/tex} and {tex}\mathrm K _ { 2 } {/tex} respectively.
If {tex}\mathrm K _ { 1 } {/tex} is {tex} 4\times 10 ^ { - 3 } , {/tex} then {tex}\mathrm K _ { 2 } {/tex} will be

A

{tex} 8 \times 10 ^ { - 3 } {/tex}

B

{tex} 16 \times 10 ^ { - 3 } {/tex}

{tex} 6.25 \times 10 ^ { 4 } {/tex}

D

{tex} 6.25 \times 10 ^ { 6 } {/tex}

Explanation


Correct Marks 4

Incorrectly Marks -1

Q 3. In which of the following reactions {tex}\mathrm{ K _ { P } > K _ { C }} ? {/tex}

A

{tex} \mathrm { N } _ { 2 } ( \mathrm { g } ) + 3 \mathrm { H } _ { 2 } ( \mathrm { g } ) \rightleftharpoons 2 \mathrm { NH } _ { 3 } ( \mathrm { g } ) {/tex}

B

{tex} \mathrm { H } _ { 2 } ( \mathrm { g } ) + \mathrm { I } _ { 2 } ( \mathrm { g } ) \rightleftharpoons 2 \mathrm { HI } ( \mathrm { g } ) {/tex}

C

{tex} \mathrm { PCl } _ { 3 } ( \mathrm { g } ) + \mathrm { Cl } _ { 2 } ( \mathrm { g } ) \rightleftharpoons \mathrm { PCl } _ { 5 } ( \mathrm { g } ) {/tex}

{tex} 2 \mathrm { SO } _ { 3 } ( \mathrm { g } ) \rightleftharpoons 2 \mathrm { SO } _ { 2 } ( \mathrm { g } ) + \mathrm { O } _ { 2 } ( \mathrm { g } ) {/tex}

Explanation

Correct Marks 4

Incorrectly Marks -1

Q 4. At {tex} 1000 \mathrm { K } , {/tex} the value of {tex} \mathrm K _ {\mathrm p } {/tex} for the reaction {tex} \mathrm { PCl } _ { 5 } \rightleftharpoons {/tex} {tex} \mathrm { PCl } _ { 3 } + \mathrm { Cl } _ { 2 } {/tex} is {tex} 20 \mathrm { R } , {/tex} then {tex} \mathrm K _ {\mathrm C } {/tex} will be

A

0.04

0.02

C

0.01

D

0.03

Explanation

Correct Marks 4

Incorrectly Marks -1

Q 5. For the reaction {tex} \mathrm { N } _ { 2 } \mathrm { O } _ { 4 } \rightleftharpoons 2 \mathrm { NO } , {/tex} degree of dissociation is {tex} \alpha {/tex} . The number of moles at equilibirum will be

A

{tex} ( 1 - \alpha ) ^ { 2 } {/tex}

{tex} ( 1 + \alpha ) {/tex}

C

3

D

1

Explanation

Correct Marks 4

Incorrectly Marks -1

Q 6. {tex}4{/tex} mole of {tex}\mathrm A {/tex} are mixed with {tex}4{/tex} mole of {tex}\mathrm B , {/tex} when {tex}2{/tex} mole of {tex}\mathrm C {/tex} are formed at equilibrium according to the reaction, {tex}\mathrm A +\mathrm B \rightleftharpoons \mathrm C +\mathrm D . {/tex} The equilibrium constant is

A

4

1

C

{tex} \sqrt { 2 } {/tex}

D

{tex} \sqrt { 4 } {/tex}

Explanation


Correct Marks 4

Incorrectly Marks -1

Q 7. {tex}6{/tex} gram hydrogen reacts with {tex} 9.023 \times 10 ^ { 23 } {/tex} chlorine molecules to form {tex} \mathrm { HCl } {/tex}. If total pressure of the reaction is {tex}800 \mathrm { mm } {/tex} then what will be the partial pressure of {tex} \mathrm { HCl } {/tex} ?

A

400{tex} \mathrm { mm } {/tex}

533{tex} \mathrm { mm } {/tex}

C

600{tex} \mathrm { mm } {/tex}

D

153.3{tex} \mathrm { mm } {/tex}

Explanation

Correct Marks 4

Incorrectly Marks -1

Q 8. {tex}20 \% {/tex} part of {tex} \mathrm { N } _ { 2 } \mathrm { O } _ { 4 } {/tex} is dissociated in {tex} \mathrm { NO } _ { 2 } {/tex} at {tex}1{/tex} atmospheric pressure. What is the value of {tex} \mathrm K _ { \mathrm p } ? {/tex}

A

0.29

B

16

C

1.6

None of these

Correct Marks 4

Incorrectly Marks -1

Q 9. Vaporisation of one mole of {tex} \mathrm { PCl } _ { 5 } {/tex} is done in a {tex} \mathrm {1 L } {/tex} container. If {tex}0.2{/tex} mole {tex} \mathrm { Cl } _ { 2 } {/tex} is formed at equilibrium, then what will be the value of equilibrium constant?

A

0.15

0.05

C

1.78

D

0.2

Correct Marks 4

Incorrectly Marks -1

Q 10. The equilibrium constant {tex}\mathrm K _ {\mathrm c } {/tex} for {tex} \mathrm A _ { ( \mathrm g ) } \rightleftharpoons \mathrm B _ { (\mathrm g ) } {/tex} is {tex}1.1{/tex} means

A

{tex} [ \mathrm { A } ] \mathrm { eq } > [ \mathrm { B } ] \mathrm { eq } {/tex}

{tex} [ \mathrm { Aeq } ] < [ \mathrm { B } ] \mathrm { eq } {/tex}

C

{tex} [ \mathrm { Aeq } ] = 1.1 \mathrm { M } {/tex}

D

{tex} [ \mathrm { Beq } ] = 1.1 \mathrm { M } {/tex}

Explanation

Correct Marks 4

Incorrectly Marks -1

Q 11. Which of the following is not Lewis acid?

A

B

C

Explanation

All jother can accept electrons. in not electron deficient.

Correct Marks 4

Incorrectly Marks -1

Q 12. Which of the following is conjugate acid of ?

B

C

D

Explanation

Conjugate acid of is

Correct Marks 4

Incorrectly Marks -1

Q 13. Which of the following species can act both as acid as well as a base?

A

C

D

Explanation

can accept or give a proton.

Correct Marks 4

Incorrectly Marks -1

Q 14. Which of the following salts will give basic solution on hydrolysis?

A

B

KCl

D

Explanation


KOH⟶ (Basic solution),

Correct Marks 4

Incorrectly Marks -1

Q 15. Which of the following salts with a concentration M will give a basic solution?

A

Ammonium acetate

B

Ammonium chloride

C

Ammonium sulphate

Sodium acetate

Explanation



NaOH (Basic solution) ,

Correct Marks 4

Incorrectly Marks -1

Q 16. The yield of in the the reaction is affected by

A

Change in pressure and temperature

B

Change in temperature and concentration of

C

Change in pressure and concentration of

Change in pressure, temperature and concentration of

Explanation


The reaction is exothermic accompanied with decrease in number of moles. So, the equilibrium is affected by temperature, pressure and concentration.

Correct Marks 4

Incorrectly Marks -1

Q 17. According to Lewis concept, an acid is a/an

A

Proton donor

B

Electron pair donor

C

Proton acceptor

Electron pair acceptor.

Explanation

Lewis acid is acceptor of a pair of electrons while lewis base is donor of a pair of electons.

Correct Marks 4

Incorrectly Marks -1

Q 18. What will be the ionisation constant of formic acid if its 0.001 M solution is 14.5% ionised?

B

C

D

Explanation

Correct Marks 4

Incorrectly Marks -1

Q 19. What is the percentage dissociation of M solution of acetic acid? .

A

10%

B

100%

1%

D

Explanation

or
% dissociation,

Correct Marks 4

Incorrectly Marks -1

Q 20. For a polybasic acid, the dissociation constants have a different values for each step, e.g.,



What is the observed trend of dissociation constants in successive stages?

B

C

D

Explanation

The values of dissociation constants for successive stages decrease.

Correct Marks 4

Incorrectly Marks -1

Q 21. mole of NaOH is added to 5 litres of water. What will be the pH of the solution?

12

B

7

C

2

D

10

Explanation

Conc. Of NaOH, or


= 12

Correct Marks 4

Incorrectly Marks -1

Q 22. What will be the pH of a soft drink if hydrogen ion concentration in sample is M?

A

B

D

Explanation

pH = - log

Correct Marks 4

Incorrectly Marks -1

Q 23. What is pOH of an aqueous solution with hydrogen ion concentration equal to ?

B

C

D

Explanation


pOH = 14 - pH, 14 -

Correct Marks 4

Incorrectly Marks -1

Q 24. Which of the following salts does not show is correct nature mentioned against it?

A

KBr solution - Neutral

NaCN solution - Acidic

C

solution- acidic

D

KF solution - Basic

Explanation

NaCN solution is basic in nature since HCN formed is a weak acid and does not hydrolyse.

NaOH ⟶ (Basic solution)

Correct Marks 4

Incorrectly Marks -1

Q 25. The degree of ionisation of an acid HA is at M concentratin. Its. Dissociation constant will be

A

C

D

Explanation