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Roasting of sulphides gives the gas 'x' ...

Roasting of sulphides gives the gas 'x' which is colourless with choking smell of burning sulphur and causes great damage to respiratory organs because of its acidic nature. It also acts a reducing agent . The gas 'x' is

A

`CO_2`

B

`SO_3`

C

`H_2S`

D

`SO_2`

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