Sulphur dioxide bleaches colouring matter by ___________.

dehydration

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oxidation

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decomposition

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reduction

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Solution

The correct option is D reduction
Sulphur dioxide bleaches coloring matter by reduction. Bleaching action of sulphur dioxide is not permanent.
$S O_{2} (g) + 2 H_{2} O \to H_{2} S O_{4} (a q) + 2 [H^{+}]$

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