Assertion (A): In the dissociation of PCl_5 at constant pressure and temperature addition of helium at equilibrium increases the dissociation of PCl. Reason (R) : Helium removes Cl_2 from the field of action.

Assertion (A): In the dissociation of PCl_5 at constant pressure and t

1.	Assertion (A): In the dissociation of PCl_5 at constant pressure and temperature addition of helium at equilibrium increases the dissociation of PCl. Reason (R) : Helium removes Cl_2 from the field of action.
Answer» Both Assertion and Reason are true and Reason is the CORRECT EXPLANATION of Assertion. Both Assertion and Reason are true but Reason is not the correct explanation of Assertion. Assertion is true but Reason is false. Both Assertion and Reason are false. Solution :Assertion is true but reason is false. `PCl_5 to PCl_3 +Cl_2` At constant pressure, when helium is added to the equilibrium, VOLUME increases. Thus, in order to maintain the K constant, degree of dissociation of `PCl_5` increases. Helium is unreactive TOWARDS chlorine gas.