Assertion :Addition of inert gases at equilibrium at constant pressure will support the dissociation of $P {C l}_{5}$ at a constant temperature. Reason: The addition of inert gas at constant volume will not affect the equilibrium.

Both Assertion and Reason are correct and Reason is the correct explanation for Assertion

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Both Assertion and Reason are correct, but Reason is not the correct explanation for Assertion

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Assertion is correct, but Reason is incorrect

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Assertion is incorrect, but Reason is correct

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Solution

The correct option is B Both Assertion and Reason are correct, but Reason is not the correct explanation for Assertion
The given reaction is :-
${P C l}_{5} ⇌ {P C l}_{3} + {C l}_{2}$
Addition of insert gas at equilibrium and at constant pressure and temperature will increase the volume of the system. So by, Le Chatelier's principle, the equilibrium shifts to the side where large no. of gaseous molecular are present i.e. in forward direction.

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Assertion :Addition of inert gases at equilibrium at constant pressure will support the dissociation of PCl5 at a constant temperature. Reason: The addition of inert gas at constant volume will not affect the equilibrium.

Assertion :Addition of inert gases at equilibrium at constant pressure will support the dissociation of $P {C l}_{5}$ at a constant temperature. Reason: The addition of inert gas at constant volume will not affect the equilibrium.