Copper sulphate crystals are of which color after purification?

White

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Black

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Blue

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Yellow

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Solution

The correct option is C Blue
To crystallize copper sulfate, it is dissolved in water and a small quantity of dilute sulphuric acid is added to prevent the hydrolysis of copper sulfate. The impurities left behind in the solution are removed by filtration. The filtrate is concentrated to the crystallization point and then cooled. On cooling, transparent blue crystals of copper sulfate separate.

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