Assertion : For PCl₅(g) PCl₃(g) + Cl₂(g). If more Cl₂ is added, the equilibrium will shift in backward direction hence equilibrium constant will decrease. Reason : Addition of inert gas to the equilibrium mixture at constant volume, does not alter the equilibrium.

When 2 Cl is added in the reaction mixture, according to the Le-Chatelier’s principle, the reaction will be shifted in backward direction but the equilibrium constant is not affected, it remains constant. The equilibrium constant is only affected by change temperature. And by addition of inert gas to the equilibrium mixture at constant volume, it does not alter the equilibrium of the reaction. Hence, option (d) is the correct answer. Paragraph for Questions 25 to 27 Effect of temperature on the equilibrium process is analyzed by using the thermodynamics. From the thermodynamics relation. Gº