Question

In the following system, $ PCl_5(g) \rightleftharpoons PCl_3(g) + Cl_2(g) $ at equilibrium, upon addition of xenon gas at constant T and p, the concentration of

• A. \( PCl_5 \) will increase
• B. \( Cl_2 \) will decrease
• C. \( PCl_5 \), \( PCl_3 \) and \( Cl_2 \) remain constant
• D. \( PCl_3 \) will increase

Hint:

Adding an inert gas at constant pressure and temperature increases the volume of the container. This causes the equilibrium to shift towards the side with more moles of gas.

Answer 1

The Correct Option is D

On addition of inert gas at constant P and T, reaction moves in the direction of greater no. of moles so it will shift in forward direction, so \( [PCl_5] \) decrease and \( [PCl_3] \) and \( [Cl_2] \) will increase.