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. 

[Co(H_{2}O)_{6}]^{3+} (aq) + 4Cl^{-}(aq) \rightleftharpoons [CoCl_{4}]^{2-}(aq) + 6H_{2}O(l) 

(i) ΔH > 0 for the reaction

(ii) ΔH < 0 for the reaction

(iii) ΔH = 0 for the reaction

(iv) The sign of ΔH cannot be predicted on the basis of this information.

Answers (1)

(i) \Delta H > 0 for the reaction

Explanation: On the cooling of the mixture, the reaction tends to move towards the backward direction, which is an endothermic reaction, and, hence, \Delta H > 0.

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