What is the correct mass-action expression for the reaction $2 A (a q) + B (a q) ⇌ C (s) + 2 D (a q)$ ?

K_{e q} = \frac{[A]^{2} [B]}{[C]^{3} [D]^{2}}

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K_{e q} = \frac{[C]^{3} [D]^{2}}{[A]^{2} [B]^{2}}

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K_{e q} = \frac{[D]^{2}}{[A]^{2} [B]}

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K_{e q} = \frac{[A]^{2} [B]}{[D]^{2}}

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K_{e q} = \frac{[C] [D]}{[A] [B]}

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Solution

The correct option is C $K_{e q} = \frac{[D]^{2}}{[A]^{2} [B]}$
The reaction is $2 A (a q) + B (a q) ⇌ C (s) + 2 D (a q)$
The correct mass-action expression is
$K_{e q} = \frac{[D]^{2} [C]}{[A]^{2} [B]}$
However C is the solid and its concentration should not appear in mass-action expression.
Hence, the correct mass-action expression is
$K_{e q} = \frac{[D]^{2}}{[A]^{2} [B]}$

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