Chemistry NCERT Exemplar Solutions Class 11th Chapter Seven

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.

In which of the following reactions, the equilibrium remains unaffected on addition of small amount of argon at constant volume?

(i) H₂ (g) + I₂ (g) ⇌ 2HI (g)

(ii) PCl₅ (g) ⇌  PCl₃ (g) + Cl₂ (g)

(iii) N₂ (g) + 3H₂ (g) ⇌
2NH₃ (g)

(iv) The equilibrium will remain unaffected in all the three cases.

At 500 K, equilibrium constant, K_c , for the following reaction is 5.

$\frac{1}{2}{\mathbf{H}}_2$ (g) + $\frac{1}{2}{\mathbf{I}}_2$  (g) ⇌ HI (g)

What would be the equilibrium constant K_c for the reaction

2HI(g) ⇌ H₂ (g) + I₂ (g)

(i) 04

(ii) 4

(iii) 25

(iv) 5

What will be the correct order of vapour pressure of water, acetone and ether at 30°C. Given that among these compounds, water has maximum boiling point and ether has minimum boiling point?

(i) Water < ether < acetone

(ii) Water < acetone < ether

(iii) Ether < acetone < water

(iv) Acetone < ether < water

On increasing the pressure, in which direction will the gas phase reaction proceed to re-establish equilibrium, is predicted by applying the Le Chatelier's principle. Consider the reaction.

N₂ (g) + 3H₂ (g) ⇌2NH₃ (g)

Which of the following is correct, if the total pressure at which the equilibrium is established, is increased without changing the temperature?

(i) K will remain same

(ii) K will decrease

(iii) K will increase

(iv) K will increase initially and decrease when pressure is very high