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Roasting of sulphides gives the gas X as...

Roasting of sulphides gives the gas X as a by product. This is a colourless gas with choking smell of burnt sulphur and causes great damage to repiratory organs as a result of acid rain. Its aqueous solution is acidic, acts as reducing agent and its acid has never been isolated. The gas X is :-

A

`SO_2`

B

`CO_2`

C

`SO_3`

D

`H_2S`

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The correct Answer is:
A
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