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

Options

A. `CO_(2)`
B. `SO_(3)`
C. `H_(2)S`
D. `SO_(2)`

Answer

D

Explanation

Roasting of sulphides produces `SO_(2)`,
`{:(" "2ZnS + 3O_(2)rarr 2ZnO + underset((X))(2SO_(2))),(2SO_(2)+2H_(2)O+O_(2)rarr 2H_(2)SO_(4)("acid rain")),(" "SO_(2)+H_(2)O rarr underset("Sulphurous acid")(H_(2)SO_(3))):}`
Sulphurous acid acts as a reducing agent. Being unstable it has never been isolated.