Hydrated sodium sulphate and hydrated copper sulphate are taken in two air tight containers X and Y respectively. When blue coloured `CoCl_(2)` is introduced into the two containers, there is colour change in one container. Identify the container and give reaseons in support of your answer.

Explanation

Hydrated sodium sulphate `rarr Na_(2)SO_(4)*10H_(2)O`
Hydrated copper sulphater `rarr CuSO_(4)*5H_(2)O`
As hydrated sodium sulphate is efflorescent in nature it loses water of crystallization. Blue coloured `CoC1_(2)` present in container "X" absorbs moisture and turns to pink coloured `CoC1_(2)*2H_(2)O`
`underset("blue")(CoC1_(2)) overset("moisture")(rarr) underset("pink")(CoC1_(2)*2H_(2)O)`