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 respiratory organs as a result of acid rain. Its aqueous solution is acidic, acts as a reducing agent and its acid has never been isolated. The gas X is

`CO_2`

`SO_3`

`H_2S`

`SO_2`

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Verified by Experts

The correct Answer is:

Roasting of sulphides produces `SO_2`,
`underset((X))(2ZnS)+3O_2 to 2ZnO+2SO_2`
`2SO_2 + 2H_2O + O_2 to 2H_2SO_4` (acid rain)
`SO_2 + H_2O to underset"Sulphurous acid"(H_2SO_3)`
Sulphurous acid acts as a reducing agent . Being unstable it has never been isolated .

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