Homogeneous and Heterogeneous Equilibria — Prelims Questions

Which of the following reactions represents a heterogeneous equilibrium?

For the reaction $2SO_2(g) + O_2(g) \rightleftharpoons 2SO_3(g)$, which is a homogeneous equilibrium, what is the correct expression for $K_c$?

Consider the heterogeneous equilibrium: $C(s) + H_2O(g) \rightleftharpoons CO(g) + H_2(g)$. What is the correct expression for $K_p$?

For the reaction $N_2(g) + 3H_2(g) \rightleftharpoons 2NH_3(g)$, if $K_c = 0.5,(mol/L)^{-2}$ at $700,K$, what is the value of $K_p$ at the same temperature? (Given $R = 0.0821,L cdot atm/(mol cdot K)$)

At a certain temperature, the equilibrium constant $K_p$ for the reaction $PCl_5(s) \rightleftharpoons PCl_3(g) + Cl_2(g)$ is $0.50,atm^2$. If the total pressure at equilibrium is $1.0,atm$, what are the partial pressures of $PCl_3(g)$ and $Cl_2(g)$?

Which of the following statements is TRUE regarding the effect of adding more solid reactant to a heterogeneous equilibrium system?