Assertion :For $P C l_{5} (g) ⇌ P C l_{3} (g) + C l_{2} (g)$ , if more $C l_{2}$ is added the equilibrium will shift in backward direction. Hence, equilibrium constant will decrease. Reason: Addition of inert gas to the equilibrium mixture at constant volume does not alter 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 D Assertion is incorrect but Reason is correct
For $P C l_{5} (g) ⇌ P C l_{3} (g) + C l_{2} (g)$ , if more $C l_{2}$ is added the equilibrium will shift in backward direction. But the value of the equilibrium constant will remain same.
Addition of inert gas to the equilibrium mixture at constant volume does not alter the equilibrium.
Thus Assertion is incorrect but Reason is correct.

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