Which of the following is the colour of ferrous sulphate crystals?

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Colourless

Green

Blue

Reddish brown

answer is B.

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Detailed Solution

The colour of ferrous sulphate crystals is green.
Ferrous sulphate is obtained as a by-product in the manufacture of titanium pigment in a displacement reaction between copper sulphate and iron. Its colour changes from light green to white colour.The reaction is as follows:

CuS O_{4} + Fe \to FeS O_{4} + Cu

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