In each of the following, total pressure set-up at equilibrium is assumed to be equal and is one atm with equilibrium constants KP given : I :CaCO3 (s) CaO (s) + CO2 (g), K1 II : NH4HS (s) NH3 (g) + H2S (g), K2 III : NH2COONH4 (s) 2NH3 (g) + CO2 (g), K3 In the increasing order :

Total pressure P 1 atm 3 2 n 1 n 4 3 2 n Initial and eqn. CaCO s CaO s CO intially 0atm 0 0 at eq 0 0 x k x P(Totalpressure) 1atm at eq NH HS s NH g H S g 0 0 0 at eq 0 x atm x atm Total pressure = x x 2x P P x 2 Hence 2 2 P 1 K x. x 4 4 2 4 3 2 n NH COONH (s) 2NH g CO (g) 0 0 0 at eq 0 2x x Total pressure 3x P P x 3 Hence 2 2 3 2P P K 2x x 3 3 x 3 4P 4 27 27 Hence 1 2 3 K K K correct answer (c) 12. Consider the equilibrium 2 2 1 CO CO(g) O (g) 2 The equilibrium constant K is given by (when <<< 1)