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Blue copper sulphate gives a white substance on heating. Its colour returns when water is added. What does this prove?

Answer and explanation

Correct answer: It had water of crystallisation

The governing concept is water of crystallisation, which is a fixed number of water molecules incorporated into certain salt crystals. Blue hydrated copper sulphate, CuSO4·5H2O, loses this water on heating and becomes white anhydrous CuSO4. Adding water restores the hydrated blue form. Therefore option B is correct; chlorine, sodium, and carbon dioxide do not explain this reversible colour change.

Related tags

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

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