Question

A compound X on heating turns from blue to white colour but if moisten with water regain its blue colour

Answer 1

it may b CuSO4
hope it hellps

Answer 2

Answer:

. EXPLANATION : Copper sulphate looses water of crystallization to become a white coloured substance called Anhydrous Copper Sulphate crystals. Adding water again to white crystals will make them blue as the compound will gain water of crystallization..