Question

what is the colour of crystal of copper sulphate?​

Answer 1

The original colour of copper sulphate is blue in colour when its heated it loses five water molecules present in it which changes the structure of a crystal hence the properties of crystals get changed which includes change in colour. When copper is heated the colour changes from blue to white as water evaporates.

blue is right answer

Answer 2

$\huge\bf\pink{Ur \: AnsWer}$

Blue..