Question

The equilibrium, PCl5(g) PCl3(g) + Cl2(g) is attained at 25C in a

closed container and an inert gas He is introduced. Which of the

following statements are correct?

(A) concentration of PCl5, PCl3 and Cl2 are changed

(B) more Cl2 is formed

(C) concentration of PCl3 is reduced

(D) Nothing happens​

Answer 1

Answer:

(A) and (D) are correct

Explanation:

the complete explanation is mentioned in the attached image

Answer 2

The correct option is B.

• The given reaction is-
• $PCl_5\rightarrow PCl_3+Cl_2$
• In this reaction, phosphorus pentachloride decomposes to produce phosphorus trichloride along with chlorine gas.
• In this reaction at equilibrium, if He gas is introduced the forward reaction is favoured and the rate of the forward reaction increases. So, to keep Kp constant the rate of decomposition of phosphorus pentachloride increases and more chlorine gas is formed.