What are the uses of sulphur dioxide?

1.	What are the uses of sulphur dioxide?
Answer» The uses of sulphur dioxide are as follows : SO₂ is used in the manufacture of H₂SO₄. In refining petroleum and also in sugar industry. In the manufacture of NaHSO₃. As an antichlor, as a disinfectant and preservative. Liquid SO₂ is used as a selective solvent to dissolve many inorganic and organic compounds. Sulphur dioxide is used for bleaching wool and silk. As a bleaching agent in moist condition due to reduction reaction (SO₂ + 2HaO → H₂SO₄ + 2[H]) colouring matter + [H] → colourless matter. On exposing the bleached matter, the colour is restored due to oxidation. Colourless matter + [O] → coloured matter. Hence the bleaching action is temporary.

Answer»

The uses of sulphur dioxide are as follows :

SO₂ is used in the manufacture of H₂SO₄.
In refining petroleum and also in sugar industry.
In the manufacture of NaHSO₃.
As an antichlor, as a disinfectant and preservative.
Liquid SO₂ is used as a selective solvent to dissolve many inorganic and organic compounds.
Sulphur dioxide is used for bleaching wool and silk. As a bleaching agent in moist condition due to reduction reaction (SO₂ + 2HaO → H₂SO₄ + 2[H]) colouring matter + [H] → colourless matter.
On exposing the bleached matter, the colour is restored due to oxidation. Colourless matter + [O] → coloured matter. Hence the bleaching action is temporary.

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