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The compounds A and B are mixed in equimolar proportion to from the products, $A + B ⇌ C + D$ . At equilibrium, one third of A and B are consumed. The equilibrium constant for the reaction is

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0.5

0.25

4.0

2.5

answer is D.

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Detailed Solution

$A + B ⇌ C + D$

At: $t = 0 : 1 + 1 ⇌ 0 + 0$

At: $t = t_{e q} : (2 / 3) + (2 / 3) ⇌ (1 / 3) + (1 / 3)$

Explanation: $K_{c} = [C] [D] / [A] [B] = (1 / 3) (1 / 3) / (2 / 3) (2 / 3) = ¼ = 0.25$

Hence, the correct option D is i.e., 0.25.

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