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Bleaching of flowers by chlorine is permanent but that of sulphurdioxide is temporary, why ?

Answer»

Bleaching Nature of Cl2

In presence of moisture, chlorine acts as a bleaching agent. Chlorine reacts with water to form HCl and HCLO. HCLO is not stable. It decomposed to produce nascent oxygen.

Cl2 + H2→ HCl + HClO

 HClO → HCl  + O

Coloured flower + Nascent oxygen  colourless flower the bleaching action of chlorine is permanent. This is due to oxidizing nature of chlorine.

Bleaching action of CO2

In presence of moisture, SO2 produces nascent hydrogen.

SO2 2H2→ H2SO4 2[H]

Coloured flower + [H]  colourless flower the bleaching is temporary. This is due to reducing nature of SO2



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