Low PRESSURE is favourable for evaporation of `H_2O(I)`. The degree of dissociation of `CaCO_3(s)` decreases with increase in pressure. If the equilibrium constant of `A_2(G)+B_2(s)` to 2AB(g) is 25, then equilibrium constant for `AB(g)to(1)/(2)(g)+(1)/(2)B_2(g)is0.2.` If SOLIDPRODUCT is added to an equilibrium mixture,then equilibrium will be unaffected.