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In which substance is the presence of water of crystallisation easily shown by colour change?

Answer and explanation

Correct answer: Blue copper sulphate

The governing concept is water of crystallisation, which is chemically bound water present in certain salt crystals. Blue copper sulphate is hydrated copper sulphate, CuSO4·5H2O. On heating, it loses this water and changes from blue to white anhydrous copper sulphate; adding water restores the blue colour. The other options do not show this characteristic reversible colour change in this test.

Related tags

Copper-SulphateWater-Of-CrystallisationColour-ChangeClass10AcidsBasesAnd SaltsAcids Bases And SaltsChemical Substances – Nature And BehaviourChemical Substances Nature And Behaviour

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