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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 have the formula CuSO₄·5H₂O. The fixed water molecules incorporated into the crystal structure are called water of crystallisation and are associated with its characteristic blue appearance. Sodium ions, chlorine gas, and carbon dioxide are not responsible for this colour, so option A is correct.

Related tags

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

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