When ferrous sulphide reacts with a sulphuric acid, the product obtained has a characteristic odour of:

urine

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fishy

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rotten egg

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pleasant

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Solution

The correct option is B rotten egg
When ferrous sulphide (iron pyrites ) reacts with a sulphuric acid, the hydrogen sulphide gas is obtained which has a characteristic odour of rotten egg.
$F e S + H_{2} S O_{4} \to F e S O_{4} + H_{2} S ↑$
This is laboratory method for the preparation of hydrogen sulphide and is carried out in kipps apparatus.

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