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What causes the blue colour of copper sulphate crystals?

Answer and explanation

Correct answer: Water of crystallisation

Copper sulphate crystals are hydrated copper sulphate, CuSO₄·5H₂O, and contain a definite number of water molecules within their crystal structure. At this school level, the characteristic blue appearance is associated with the hydrated crystalline form and its water of crystallisation. Therefore option A is the expected answer. Sodium ions, chlorine gas, and hydrogen gas are not constituents responsible for these crystals’ blue colour.

Related tags

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

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