Question

Blue crystals of copper sulphate on heating in a dry test tube become colorless. Give reasons.​

Answer 1

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» The answer is addition if O2 Which is simply known as the oxidation

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Answer 2

This is because CuSO4 Is chemically  bonded with water to give the crystalline blu colur. On heating, the water evaporated, breaking the bond of CuSO4 and Water, thus giving a white precipitate. The reaction is like this
Heating
CuSO4.H2O-------------> CuSO4 (Water evaporates)