1.

Account for bleaching of flowers by chlorine is permanent but that by sulphur dioxide is temporary.

Answer»

In presence of moisture, chlorine acts as an oxidizing agent and a bleaching agent.

Cl2 + H2O → HCl + HOCl(Unstable)

HOCl → HCl + O Nascent oxygen

Coloured matter to → Colourless matter.

The bleaching action is permanent due to Nascent oxygen. Bleaching action of SO2 in presence of moisture is due to Mascent hydrogen.

2SO4 + 2H2O → H2SO4 + 2H

Coloured matter + H → colours matter

So, bleaching action of SO2 is temporary



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