Assuming , for which of the following gaseous equilibrium reactions is ? — Chemical Equilibrium Chemistry Question

💡 Solution & Explanation

From the relation $K_p = K_c(RT)^{\Delta n_g}$, for $K_p$ to be strictly greater than $K_c$ when $RT > 1$, the exponent $\Delta n_g$ must be positive ($\Delta n_g > 0$). In the dissociation of $PCl_5$, $\Delta n_g = (1 + 1) - 1 = 1$, making $K_p > K_c$.