Discussion
Chlorine is used as a bleaching agent. This bleaching property is due to
Answer: C
The bleaching action of chlorine is due to oxidation.
In the presence of moisture, chlorine forms hypochlorous acid, which releases nascent oxygen: Cl2 + H2O → HCl + HOCl, and HOCl → HCl + [O]. The nascent oxygen oxidises coloured substances to colourless ones, so the bleaching is permanent.
Reduction is how sulphur dioxide bleaches (temporarily). 'Chlorination' and hydrogenation are not the mechanism of chlorine's bleaching action.
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