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)hArr[CoCl_(4)]^(2-)(aq)+6H_(2)O(l)),("(pink)" "" "(blue)"):}

When hydrochloric acid is added to cobalt nitrate solution at room tem

1.	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)hArr[CoCl_(4)]^(2-)(aq)+6H_(2)O(l)),("(pink)" "" "(blue)"):}
Answer» `Delta H gt 0` for the REACTION `Delta lt 0` for the reaction `Delta H = 0` for the reaction The sign of `DELTAH` cannot bepredicted on the basis of this information. Solution :On cooling , the equilibrium SHIFTS backward or on HEATING , the equilibrium shifts FORWARD. Hence, reaction is endothermic, i.e., `Delta H gt 0`.