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  • Assertion (A): In the dissociation of PCI5 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.

In the following question, 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 PCI5 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.

(i) Both A and R are true, and R is the correct explanation of A.

(ii) Both A and R are true, but R is not the correct explanation of A.

(iii) A is true, but R is false.

(iv) Both A and R are false.

Answers (1)

(iv) Both A and R are false.

 Explanation: If the volume remains constant and an inert gas such as argon is added, the equilibrium remains undisturbed because it does not take part in the reaction.

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