When hydrochloric acid is added to cobalt nitrate solution at room temperature, the following reaction takes place and the solution turns blue. {:([Co(H_(2)O)_(6)]^(3+)(aq)+4Cl^(-)(aq) to [CoCl_(4)]^(2-)(aq)+6H_(2)O(l)),("pink""blue"):} However when cooled to a temperature below room tempertaure, the solution turns pink . On the basis of this information mark the appropriate option :

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 solution turns blue. {:([Co(H_(2)O)_(6)]^(3+)(aq)+4Cl^(-)(aq) to [CoCl_(4)]^(2-)(aq)+6H_(2)O(l)),("pink""blue"):} However when cooled to a temperature below room tempertaure, the solution turns pink . On the basis of this information mark the appropriate option :
Answer» `DeltaH=0` for the REACTION `DeltaHgt0` for the reaction `DELTAHLT0` for the reaction `DeltaH` can not be concluded Solution :`DeltaH gt 0`, b/c on decreasing the temp. `RX^(N)` GOES backward.