Equilibrium's Question 47 | Chemistry XI - Part 1 | NCERT Exemplar Questions

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MCQ (Single Correct Answer)

Assertion (A) For any chemical reaction at a particular temperature, the equilibrium constant is fixed and is a characteristic property.

Reason (R) Equilibrium constant is independent of temperature.

Both $A$ and $R$ are true and $R$ is the correct explanation of $A$

Both $A$ and $R$ are true but $R$ is not the correct explanation of $A$

$A$ is true but $R$ is false

Both $A$ and $R$ are false

MCQ (Single Correct Answer)

Assertion (A) Aqueous solution of ammonium carbonate is basic.

Reason (R) Acidic/basic nature of a salt solution of a salt of weak acid and weak base depends on $\mathrm{K}_{\mathrm{a}}$ and $\mathrm{K}_{\mathrm{b}}$ value of the acid and the base forming it.

Both $A$ and $R$ are true and $R$ is the correct explanation of $A$

Both $A$ and $R$ are true but $R$ is not the correct explanation of $A$

$A$ is true but $R$ is false

Both $A$ and $R$ are false

MCQ (Single Correct Answer)

Assertion (A) An aqueous solution of ammonium acetate can act as a buffer.

Reason (R) Acetic acid is a weak acid and $\mathrm{NH}_4 \mathrm{OH}$ is a weak base.

Both $A$ and $R$ are true and $R$ is the correct explanation of $A$

Both A and R are true but R is not the correct explanation of A

$A$ is false but $R$ is true

Both $A$ and $R$ are false

MCQ (Single Correct Answer)

Assertion (A) In the dissociation of $\mathrm{PCl}_5$ at constant pressure and temperature the addition of helium at equilibrium increases the dissociation of $\mathrm{PCl}_5$.

Reason (R) Helium removes $\mathrm{Cl}_2$ from the field of action.

Both $A$ and $R$ are true and $R$ is the correct explanation of $A$

Both $A$ and $R$ are true but $R$ is not the correct explanation of $A$

$A$ is true but $R$ is false

Both $A$ and $R$ are false

Subjective

How can you predict the following stages of a reaction by comparing the value of $K_c$ and $Q_c$ ?

(i) Net reaction proceeds in the forward direction.

(ii) Net reaction proceeds in the backward direction.

(iii) No net reaction occurs.

Explanation

Prediction of the following stages of a reaction by comparing the value of $K_c$ and $Q_c$ are

(i) If $Q_c< K_c$, the reaction will proceed in the direction of the products (forward reaction).

(ii) If $Q_c>K_c$, the reaction will proceed in the direction of reactants (reverse reaction).

(iii) If $Q_c=K_c$, the reaction mixture is already at equilibrium.

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