Equilibrium

Assertion (A) : A solution containing a mixture of acetic acid and sodium acetate maintains a constant value of pH on addition of small amounts of acid or alkali.

Reason (R) : A solution containing a mixture of acetic acid and sodium acetate acts as a buffer solution around pH 4.75.

(i) Both A and R are true and R is correct explanation of A.

(ii) Both A and R are true but R is not the correct explanation of A.

(iii) A is true but R is false.

(iv) Both A and R are false.

Match Column (I) with Column (II). Column I Column II-

Match the following graphical variation with their description-

                A                                                                                                B 

	(a) Variation in product concentration with time
	(b) Reaction at equilibrium
	(c) Variation in reactant concentration with time

Match the following species with the corresponding conjugate acid.

Match standard free energy of the reaction with the corresponding equilibrium constant.

For the reaction : N₂(g) + 3H₂(g) ? 2NH₃(g)

Equilibrium constant K_c = $\frac{{\left[{\mathbf{N}\mathbf{H}}_3\mathbf{}\right]}^2}{\left[{\mathbf{N}}_2\mathbf{}\right]{\left[{\mathbf{H}}_3\mathbf{}\right]}^3\mathbf{ }}$

Some reactions are written below in Column I and their equilibrium constants in terms of K_c are written in Column II. Match the following reactions with the corresponding equilibrium constant.

Match the following equilibria with the corresponding condition.

At a particular temperature and atmospheric pressure, the solid and liquid phases of a pure substance can exist in equilibrium. Which of the following term defines this temperature?

(i) Normal melting point

(ii) Equilibrium temperature

(iii) Boiling point

(iv) Freezing point

In the following questions two or more options may be correct.

For the reaction N₂O₄ (g) ⇌2NO₂ (g), the value of K is 50 at 400 K and 1700 at 500 K. Which of the following options is correct?

(i) The reaction is endothermic

(ii) The reaction is exothermic

(iii) If NO₂ (g) and N₂O₄ (g) are mixed at 400 K at partial pressures 20 bar and 2 bar respectively, more N₂O₄ (g) will be formed.

(iv) The entropy of the system increases.