Question

blue crystals of copper sulphate on heating in a dry test tube become colourless give reason

Answer 1

The blue coloured copper sulphate crystals turns white due to the loss of water molecules. The formula ofcopper sulphate is CuSO4.5H2O. Whencopper sulphate is heated, it looses water molecules and hence it loosesblue colour.

Answer 2

bcz the water content will be decreses in cuso4on heating