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 answerCoH2O63+ (Pink )(aq)+4Cl-(aq) ⇌ CoCl42- (Blue) (aq)+6H2O(l)

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ΔH>0 for the reaction

ΔH<0 for the reaction

ΔH=0 for the reaction

The sign of ΔH cannot be predicted on the basis of this information

answer is A.

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Detailed Solution

In the reaction,CoH2O63+(aq)+4Cl-(aq)⇌CoCl42- (Blue) (aq)+6H2O(l)On cooling, the equilibrium shifts backward direction or on heating, the equilibrium shifts forward direction. Hence, reaction is endothermic, i.e. ΔH>0

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