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When green cr...

Question

When green crystals of ferrous sulphate are heated, the colour of the crystals changes because:

A

It decomposes to ferric oxide

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B

It loses water of crystallisation

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C

It evolves

S O_{2}

gas

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D

It evolves

S O_{3}

gas

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Solution

The correct option is B It loses water of crystallisation
On heating, ferrous sulphate crystals lose water and anhydrous ferrous sulphate $(F e S O_{4})$ is formed. So their colour changes from light green to white.

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