Question

Statement 1: Association of an inert gas at constant pressure to dissociation equilibrium of $PCI_5\rightleftharpoons PCl_3 + Cl_2$ favours forward reaction.
Statement 2: $K_{c}=\frac{\alpha^{2}}{V\left(1-\alpha\right)}$ for the dissociation equilibrium of $PCl_5$ where a is degree of dissociation of $PCI_5$

• A. If both Statement 1 and Statement 2 are true and the statement 2 is the correct explanation o f the statement 1 .
• B. Ifboth Statement 1 and Statement 2 are true but statement 2 is not the correct explanation o f the statement 1 .
• C. If Statement 1 is true but Statement 2 is false.
• D. If Statement 1 is false but Statement 2 is true.

Answer 1

Answer: (A)

Inert gas addition at constant pressure leads to an increase in volume. To have $K_c$ constant $\alpha$ must increase.