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What causes the blue colour of copper sulphate crystals?

Answer and explanation

Correct answer: Water of crystallisation

Blue copper sulphate crystals are hydrated copper sulphate, CuSO₄·5H₂O. The definite water molecules held within the crystal lattice are called water of crystallisation, and their presence gives the crystals their characteristic blue appearance. Sodium ions, chlorine gas, and hydrogen gas are not constituents responsible for this colour. Hence, option A is the best answer.

Related tags

Copper SulphateWater Of CrystallisationHydrated SaltCrystalsAcidsBasesAnd SaltsAcids Bases And SaltsChemical Substances – Nature And BehaviourChemical Substances Nature And Behaviour

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