Q. The effect of addition of helium gas to the following reaction in equilibrium state at constant volume, is : $\mathrm{PCl_5(g) \rightleftharpoons PCl_3(g) + Cl_2(g)}$
A) the equilibrium will shift in the forward direction and more of $\mathrm{Cl_2}$ and $\mathrm{PCl_3}$ gases will be produced.
B) the equilibrium will go backward due to suppression of dissociation of $\mathrm{PCl_5}$.
C) helium will deactivate $\mathrm{PCl_5}$ and reaction will stop.
D) addition of helium will not affect the equilibrium.
Explanation
The correct answer is Option D: addition of helium will not affect the equilibrium..
A detailed explanation for this question is being prepared.
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.