Bleaching of flowers by chlorine is permanet, while that by sulphur di – InterviewSolution

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