Chemistry - Chemical Equilibrium Question with Solution | TestHub

$\begin{array}{cccccc}& {\text{PCl}}_5\left(\text{g}\right)& \rightleftharpoons & {\text{PCl}}_3\left(\text{g}\right)& +& {\text{Cl}}_2\left(\text{g}\right)\\ \text{mole at equilibrium}& \text{a}-\text{x}& & \text{x}& & \text{x}\end{array}$

${\text{K}}_{\text{C}}=\frac{{\text{x}}^2}{\left(\text{a}-\text{x}\right)\text{V}}$

Addition inert gas at constant V has no effect on reactions having$\Delta \text{n}=0\text{ or }\Delta \text{n}\ne 0$. But addition of inert gas at constant P has effect on reactions having$\Delta \text{n}\ne 0$; and no effect if$\Delta \text{n}=0$. The given reaction has$\Delta \text{n}\ne \mathrm{0 :}$on addition of inert gas at constant P, volume increases. To have K_Cconstant, x must increase.