Roasting os sulphide ore gives the gas (A). (A) is a colourless gas. Aqueous solution of (A) is acidic. The gas (A) is

Roasting of sulphide ore is generally performed in

Roasting of sulphide ore is generally performed in

Roasting of sulphides gives the gas X as a by product. This is a colourless gas ith 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 :-

Which of the following is colourless gas