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For the reaction $H_{2} + I_{2} ⇋ 2 H I$ the equilibrium constant (K) is

A. $\frac{{[H I]}^{2}}{{[H_{2}]}^{2} [I_{2}]}$

B. $\frac{[H I]}{\sqrt{[H_{2}]} \sqrt{[I_{2}]}}$

C. $\frac{[H_{2}] [I_{2}]}{{[H + I]}^{2}}$

D. $\frac{{[H I]}^{2}}{[H_{2}] [I_{2}]}$

Correct Answer :

D. $\frac{{[H I]}^{2}}{[H_{2}] [I_{2}]}$

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