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Why does the blue colour return when water is added after heating blue copper sulphate crystals?

Answer and explanation

Correct answer: Water of crystallisation is regained

Blue copper sulphate crystals are hydrated copper sulphate, commonly represented as CuSO₄·5H₂O. Heating removes their water of crystallisation and produces white anhydrous CuSO₄. When water is added again, hydration occurs and the characteristic blue hydrated form is restored. Hence option A is correct. No copper metal or sulphur gas is formed, and the colour change is not caused by the solution becoming basic.

Related tags

Copper SulphateWater Of CrystallisationHydrationAcidsBasesAnd SaltsAcids Bases And SaltsChemical Substances – Nature And BehaviourChemical Substances Nature And BehaviourScience

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