Which of the following salt has a blue colour and why? CuSO4.5H2O or CuSO4.

CuSO4.5H2O has blue colour due to the presence of water of crystallization. There is a presence of water in the molecule. If it would be anhydrous the colour will be white because it won’t have water molecule. Copper sulphate itself will have no colour due to the absence of water molecule