Assertion : $A (s) ⇌ B (g) + C (g); K p_{1}$
$X (s) ⇌ B (g) + Y (g); K p_{2} = 3 K p_{1}$
Total pressure of B over the mixture of solid A and X is greater than pressure of B either over excess solid A or over excess solid X but less then their directly sumup value when excess of solid A and excess of solid X kept in different container. Reason: In presence of each other, degree of dissociation of both solids decreases.

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 A Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
simultaneous equilibrium show in this question
When more than one equilibrium is established in a vessel at the same time and anyone of the reactant or product is common in more than one equilibrium, then the equilibrium concentration of the common species in all the equilibrium would be same. the total pressure of B is solid A and X is greater than pressure of B
because of the degree of dissociation of both solid decreases so the assertion and reason are correct A is correct

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