Question
Bleaching action of chlorine is permanent. Justify this statement.

Answer

Chlorine is a strong oxidising and bleaching agent because of the nascent oxygen.
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Colouring matter + Nascent oxygen $\rightarrow$ Colourless oxidation product
Therefore, bleaching of chlorine is permanent. It oxidises ferrous salts to ferric, sulphites to sulphates and hydrogen sulphide to sulphur.
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