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White anhydrous copper sulphate turns blue when water is added. What does this show?

Answer and explanation

Correct answer: Presence of water

Anhydrous copper sulphate, CuSO₄, is white because it contains no water of crystallisation. When water is added, hydrated copper sulphate, commonly represented as CuSO₄·5H₂O, forms and the solid becomes blue. This characteristic colour change is therefore used as a simple test for water, making option A correct. Chlorine, hydrogen, and nitrogen do not cause this specific white-to-blue change in anhydrous copper sulphate.

Related tags

Copper-SulphateWater-TestHydrated-SaltWater-Of-CrystallisationAcidsBasesAnd SaltsAcids Bases And SaltsChemical Substances – Nature And BehaviourChemical Substances Nature And Behaviour

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