Sulphur dioxide bleaches colouring matter by
(A) reduction
(B) dehydration
(C) decomposition
(D) oxidation
Correct Answer : reduction
Explanation : Sulphur dioxide gas exhibits bleaching properties in presence of moisture. It dissolves in water liberating nascent hydrogen. Nascent hydrogen removes oxygen atoms from the colouring matter (reduces colouring matter) and it loses its colour.
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