The effect of addition of helium gas to the following reaction in equilibrium state, is : $\mathrm{PCl}_{5}(\mathrm{g}) \rightleftharpoons \mathrm{PCl}_{3}(\mathrm{g})+\mathrm{Cl}_{2}(\mathrm{g})$

Question

The effect of addition of helium gas to the following reaction in equilibrium state, is :

$\mathrm{PCl}_{5}(\mathrm{g}) \rightleftharpoons \mathrm{PCl}_{3}(\mathrm{g})+\mathrm{Cl}_{2}(\mathrm{g})$

the equilibrium will shift in the forward direction and more of $\mathrm{Cl}_{2}$ and $\mathrm{PCl}_{3}$ gases will be produced.

addition of helium will not affect the equilibrium.

helium will deactivate $\mathrm{PCl}_{5}$ and reaction will stop.

the equilibrium will go backward due to suppression of dissociation of $\mathrm{PCl}_{5}$.

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