Question

in what colour the copper sulphate crystals changes on heating​

Answer 1

as the colour of copper sulphate crystals are blue but after heating the crystals changes into white crystals

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Answer 2

Answer:

when copper sulphate is heated for some time, the blue colour disappears and it becomes white-gray in colour. This is because the water molecules are lost on heating and copper sulphate pentahydrate is converted to anhydrous copper sulphate.