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

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

NEETNEET 2013General Principles and Processes of Isolation of Elements

Solution:

$SO_2$ gas is obtained when any sulphide ore is roasted.
$2M_2S+ 3 O_2 \xrightarrow{\Delta} 2M_2O + 2 SO_2$
This gas exhibits all the characteristics given in the question.