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 add rain. It aqueous solution is acidic. acts as reducing agent and its acid has never been isolated. The gas $X$ is :-

C O_{2}

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H_{2} S

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S O_{2}

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S O_{3}

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Solution

The correct option is C $S O_{2}$
In roasting, the ore is heated in a regular supply of air in a furnace at a temperature below the melting point of the metal. Some of the reactions involving sulphide ores are:
$2 Z n S + 3 O_{2} \to 2 Z n O + 2 S O_{2} 2 P b S + 3 O_{2} \to 2 P b O + 2 S O_{2} 2 C u_{2} S + 3 O_{2} \to 2 C u_{2} O + 2 S O_{2}$
The sulphide ores of copper are heated in reverberatory furnace.
$S O_{2}$ has a choking smell and causes acid rain.

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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 add rain. It aqueous solution is acidic. acts as reducing agent and its acid has never been isolated. The gas X is :-

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 add rain. It aqueous solution is acidic. acts as reducing agent and its acid has never been isolated. The gas $X$ is :-