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Bleaching action of SO2, is due to :...

Bleaching action of `SO_2`, is due to :

A

Oxidation

B

Reduction

C

Acidic nature

D

Hydrolysis

Text Solution

Verified by Experts

The correct Answer is:
B
Bleaching Action : `SO_2` is a mild bleaching agent. Its bleaching action is due to reduction of the vegetable coloring matter by nascent hydrogen liberated in the presence of moisture.
` SO_2 +2H_2 O to H_2 SO_4 + 3[H]`
Vegetable colouring matter + [H] `to` colourless vegetable matter The bleaching by `SO_2` is however, temporary, when the bleached article is exposed to air, it regains its colour due to oxidation.
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