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What colour appears when water is added to white anhydrous copper sulphate?

Answer and explanation

Correct answer: Blue

Anhydrous copper sulphate, CuSO₄, is white because it contains no water of crystallisation. When water is added, hydration occurs and blue hydrated copper sulphate, CuSO₄·5H₂O, is produced. This is the reverse of the colour change seen on heating blue crystals. The substance does not become red, yellow or black in this standard reaction, so option A, blue, is correct.

Related tags

HydrationCopper SulphateWater Of CrystallisationSaltsColour ChangeAcidsBasesAnd SaltsAcids Bases And SaltsChemical Substances – Nature And Behaviour

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