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What causes the blue colour of copper sulphate crystals?

Answer and explanation

Correct answer: Water of crystallisation

The governing concept is water of crystallisation in hydrated salts. Blue copper sulphate crystals are represented as CuSO4·5H2O, meaning that a fixed number of water molecules are incorporated into the crystal structure. This hydrated form has its characteristic blue colour. On heating, the water is removed and anhydrous copper sulphate becomes white. Hence option A is correct; sodium ions, chlorine gas and carbon dioxide are not responsible for this colour.

Related tags

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

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