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Why does the blue colour of copper sulphate disappear on heating?

Answer and explanation

Correct answer: Water of crystallisation is removed

Blue copper sulphate crystals contain water of crystallisation and can be written as CuSO₄·5H₂O. On heating, this water is driven out, producing anhydrous copper sulphate, which is white. Adding water restores the blue hydrated form. Sodium, chlorine, and sugar are not formed in this change, so option A gives the correct explanation.

Related tags

Copper SulphateHeatingWater Of CrystallisationAcidsBasesAnd SaltsAcids Bases And SaltsChemical Substances – Nature And BehaviourChemical Substances Nature And BehaviourScience

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