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Bleaching of flowers by Cl2 is permanent, by SO2 it is temporary. Explain?

Bleaching of flowers by Cl2 is permanent, by SO2 it is temporary. Explain?

Grade:upto college level

2 Answers

Gaurav
askIITians Faculty 164 Points
9 years ago
Both sulphur dioxide and chlorine are good bleaching agents. Bleaching action of chlorine is based on oxidation while that of sulphur is based on reduction.
Chlorine acts with water to produce nascent oxygen. This oxygen combines with colourd substance and makes it colourless.
Sulphour dioxide removes oxygen from the coloured substance and makes it colourless. But atmospheric oxygen slowly takes place of the removed oxygen and because of which the material regains the colour.
Rishi Sharma
askIITians Faculty 646 Points
3 years ago
Dear Student,
Please find below the solution to your problem.

Both sulphur dioxide and chlorine are good bleaching agents.
Bleaching action of chlorine is based on oxidation while that of sulphur is based on reduction.
Chlorine acts with water to produce nascent oxygen.
This oxygen combines with colourd substance and makes it colourless.
Sulphour dioxide removes oxygen from the coloured substance and makes it colourless.
But atmospheric oxygen slowly takes place of the removed oxygen and because of which the material regains the colour.

Thanks and Regards

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