The degree of dissociation of PCl5() obeying the equilibrium, PCl5(g) PCl3(g) + Cl2(g) is approximately related to the pressure at equilibrium by   Option 1)  ∝ P Option 2)  ∝  Option 3)  ∝ Option 4)  ∝

As we learnt in

Equilibrium constant in gaseous system -

For equilibrium involving gases, it is usually more convenient to express the equilibrium constant in terms of partial pressure.

- wherein

The ideal gas equation is written as

Let's consider the given reaction

Total pressure =P

Option 1)

∝ P

This option is incorrect

Option 2)

∝

This option is correct

Option 3)

∝

This option is incorrect

Option 4)

∝

This option is incorrect