Sulphur dioxide bleaches colouring matter by :

reduction

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oxidation

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dehydration

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decomposition

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none of the above

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Solution

The correct option is B reduction
Sulphur dioxide bleaches by reduction. Presence of moisture is essential for bleaching.
$S O_{2} (g) + 2 H_{2} O \to H_{2} S O_{4} (a q .) + 2 {[H]}^{+}$
$2 {[H]}^{+}$ + colouring matter → Colourless matter

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Similar questions

The temporary bleaching action by sulphur dioxide can be reversed by reacting the material with :

S O_{2}

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