Roasting of sulphides gives the gas ‘X’ as a by product. This is a colourless gas with choking smell of burning sulphur and causes great damage to respiratory organs as a result of acid rain. Its aqeous solutions is acidic, acts as reducing agent and the acid has never been isolated. The gas ‘X’ is.

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SO₂

H₂S

CO₂

SO₃

answer is D.

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Detailed Solution

Roasting of sulphides gives the gas SO₂ as a byproduct. This is a colorless gas with cooking smell of burnt sulphur and causes 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.

For example, sulphur dioxide gas is obtained by roasting zinc blende or iron pyrites.

2ZnS+3O₂→2ZnO+2SO₂

4Fes₂+11O₂→2F₂O₃+8SO₂

Sulphur dioxide dissolves in water forming sulphureous acid. hence, it is known as sulphureous anhydride.

H₂O+SO₂⇌H₂SO₃

It reduces chlorine to HCl.

SO₂+Cl₂+2H₂O→H₂SO₄+2HCl
Hence it is SO₂ gas.

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