Note: In the following questions a statement of Assertion (A) followed by a statement of Reason (R) is given. Choose the correct option out of the choices given below each question.
Assertion (A): In the dissociation of PCl5 at constant pressure and temperature addition of helium at Equilibrium increases the dissociation of PCl5 .
Reason (R) : Helium removes Cl2 from the field of action.
At constant temperature and pressure, addition of inert gas does not bring any change in Equilibrium because the addition of inert gas does not change the partial pressure of other gases in the reaction mixture and therefore, it does not affect the dissociation of reactant (PCl5) also.
Since, helium is an inert gas it will not react with any other gas in reaction mixture and thus, does not remove Cl2 from field of action.