why bleaching of flowers is permanent by chlorine while temporary by sulphur dioxide.?
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chlorine is a permanent bleaching agent and so2 is a temporary bleeching agent
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Hey !!
Cl₂ bleaches coloured material by oxidation
Cl₂ + H₂O ------> 2HCl + O
Coloured Material + [O] -----> Colourless
Hence, bleaching is permanent.
In contrast, SO₂ bleaches coloured material by reduction and hence bleaching is temporary since when the bleached colourless material is exposed to air, it gets oxidised and the colour is restored.
SO₂ + 2H₂O -----> H₂SO₄ + 2H
Coloured Material + H -----> Colourless material --(aerial)--> Colourless material
Oxidation........!!
Good luck !!
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