Bleaching of flowers by chlorine permanent while that by 'SO2', is temporary. Explain.

Explanation

Ans: Thie bleaching action of chlorine is through oxidation. ..Cl_2+H_2 O rarr 2 HCl+C O].
Coloured-materials .+[O] stackrel*/rarr. colourless Hence bleaching is permanent. Büt the bleaching? action of .SO_2. is through reduction. Hence bleaching is temporary. When the bleached colourless material is exposed to air. .it gets oxidised and the colour is restored. .SO_2+2 H_2 O rarr 2 H_2 SO_4+2[H].
Coloured material .+[H] rarr. colgurless material.
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