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Dear Student
The bleaching action by chlorine is based on Oxidation means it requires nascent oxygen forBleaching action. While sulphur dioxide bleaching is based upon the reduction (Use of the nascent hydrogen)Another difference is the bleaching action of sulphur dioxide is temporary while bleaching Action of chlorine is permanent. Basically bleaching action by chlorine is strong-Used for bleaching cotton, jute,It alsoDamages delicate fibres by vigorous reaction. While SO2 is Mild bleaching agent..Used to bleach delicate fibres like silk,wool..Does not damage fabric as its not strong.
We hope that clarifies your query.
Regards
Arun (askIITians forum expert)
Sulphur dioxide is a temporary bleaching agent, unlike Chlorine, which is a permanent bleaching agent! This is because the mechanism for bleaching is different:
Sulphur dioxide removes oxygen from the coloured substance and makes it colourless. But atmospheric oxygen slowly takes place of the removed oxygen and because of which the material regains the colour.
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