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What colour do blue copper sulphate crystals become on heating?

Answer and explanation

Correct answer: White

Blue copper sulphate crystals are hydrated copper sulphate, CuSO₄·5H₂O, and their blue colour is associated with water of crystallisation. On heating, this water is removed and anhydrous copper sulphate, CuSO₄, is formed, which is white. The change is reversible when water is added again. The crystals do not become red, green or black under the stated school-level condition, so option A is correct.

Related tags

Copper SulphateWater Of CrystallisationThermal DecompositionSaltsChemical ChangeAcidsBasesAnd SaltsAcids Bases And SaltsChemical Substances – Nature And Behaviour

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