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Bleaching of flowers by chlorine is perm...

Bleaching of flowers by chlorine is permanet, while that by sulphur dioxide is tempory. Explain.

Text Solution

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Chlorine bleaches coloured material by oxidation:
`Cl_(2)+H_(2)O to 2HCl+[O]`
Coloured `+[O] to "colourless material"`
Hence, the bleaching is permanent.
Whereas, sulphur dioxide, `SO_(2)` bleaches coloured material by reduction and hence bleaching is temporary. When the bleached colourless material is exposed to air, it gets oxidised and the colour is restored.
`SO_(2)+2H_(2)Oto 2H_(2)SO_(4)+2[H]`
`underset("material")("Coloured")+[H]underset("material")("Colourless")overset("Aerial")underset("Oxidation")(rarr)underset("material")("Coloured")`.
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