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2NO₂(brown) $⇌$ N₂O₄(colorless).When the equilibrium mixture is cooled to below O⁰C, the intensity of brown color decreases. Correct statement about the equilibrium system is

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Forward reaction is endothermic

Backward reaction is endothermic

Equilibrium constant increases with increase in temperature

Equilibrium constant increases with decrease in temperature

answer is D.

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Detailed Solution

Since on cooling mixture intensity of brown color decreases indicates that forward reaction is exothermic . For exothermic reactions temperature increases,k_c decreases.

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