Roasting of sulphides gives the gas X as a by product. This is colourless gas with choking smell of burnt sulphur and cause great damage to respiratory organs as a result of acid rain. Its aqueous sol

Question

Roasting of sulphides gives the gas X as a by product. This is colourless gas with choking smell of burnt sulphur and cause 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

TestHub · Accepted Answer

Roasting is used to convert metal sulphide ores into $M S O_{4}$ and MO.
$M S \overset{Δ}{\to} M O + S O_{2}$
$S O_{2}$ is a colourless gas with choking smell of burnt sulphur and cause great damage to respiratory organs and result in acid rain. Its aqueous solution is acidic, acts as a reducing agent.
Sulphur dioxide dissolves in water forming sulphurous acid hence, it is known as sulphurous anhydride.
$H_{2} O + S O_{2} ⇌ H_{2} S O_{3}$
It reduces chlorine to HCl.
$S O_{2} + C l_{2} + 2 H_{2} O \to H_{2} S O_{4} + 2 H C l$

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