For the reaction CO(g) + Cl2(g) ⇄  COCl2(g) the ratio Kp/ KC is equal to

We known that kp = kc (RT)△n  where Δn = number of moles of products in gaseous  phase number of moles of reactants gaseous phase = 1 – 2 = -1 substituting we get KP=Kc(RT)−1⇒KPKC=1RT