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What happens when water is added to white anhydrous copper sulphate?

Answer and explanation

Correct answer: Blue

Anhydrous copper sulphate is white because it lacks water of crystallisation. When water is added, it becomes hydrated copper sulphate, CuSO₄·5H₂O, which has a characteristic blue colour. This hydration change explains the observation. The substance does not become red, yellow, or black under the stated conditions, so the correct observation is blue, option A.

Related tags

ScienceClass10Acids-Bases-SaltsCopper-SulphateHydrationWater-Of-CrystallisationAcidsBasesAnd SaltsAcids Bases And Salts

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