50. Assertion (A) In the dissociation of PCl5 at constant pressure and temperature the addition of helium at equilbrium increases the dissociation of PCl5.
Reason (R) Helium removes Cl2 from the field at action.
(a) Both A and R are true and R is the correct explanation of A
(b) Both A and R are true but R is not the correct explanation of A
(c) A is true but R is false
(d) Both A and R are false