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What causes the blue colour of copper sulphate crystals?

Answer and explanation

Correct answer: Water of crystallisation

Hydrated copper sulphate crystals are represented as CuSO₄·5H₂O. The fixed water molecules in this crystalline structure are called water of crystallisation and are associated with the characteristic blue appearance of the hydrated salt. Sodium ions are absent, and chlorine or hydrogen gas is not responsible for the colour. Therefore option A is the intended correct answer.

Related tags

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

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