Inert gas is added to the equilibrium mixture of PCl5(g)⇌PCl3(g)+Cl2(g)  at constant pressure. Which of the following statements is correct

PCl5⇌    PCl3   +    Cl2          Initial no. of moles                1                  0              0          No. of moles at eq.                1 – x            x              x          Molar concentrations at eq. 1−xv            xv             xv KC=[PCl3][Cl2][PCl5]=x2v(1−x) If inert gas is introduced at constant pressure the volume increases and hence to keep KC constant   [PCl3] and [Cl2]  increases