Ncert Exercises & Solutions

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

(d) Both A and R are false

(c) 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 PCl₅ increases. Helium is unreactive towards chlorine gas.

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