Q.

When hydrochloric acid is added to cobalt nitrate solution at room temperature, the following reaction takes place and the reaction mixture becomes blue. On cooling the mixture it becomes pink. On the basis of this information mark the correct answer.

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∆H > 0 for the reaction

∆H < 0 for the reaction

∆H = 0 for the reaction

The sign of ∆H cannto be predicted on the basis of this formation

answer is A.

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Detailed Solution

At room temperature, reaction mixture is blue;In freezing mixture, reaction mixture is pink, thus decrease in temperature favours backward reaction.∴backward reaction is exothermic.We may conclude that forward reaction is endothermic, ΔH > 0

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