What is the common name of copper sulphate?

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Blue vitriol

answer is D.

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Detailed Solution

Concept- The chemical formula of copper sulphate is

CuS O_{4}

and it is systematically named as Copper (II) sulphate or cupric sulphate.
Blue vitriol is the hydrate form of copper sulphate and is known as copper sulphate pentahydrate. Its chemical formula is

CuS O_{4} . 5 H_{2} O

. This chemical is bright blue in colour and it is prepared by oxidising copper with hot concentrated sulfuric acid.
Blue vitriol is useful as an insecticides and germicides and is also used as an electrolyte in batteries.
Thus, the common name of copper sulphate is blue vitriol.
Hence, the correct answer is 4.

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