Answer : Bleaching action of SO2 is due to reduction and it is temporary.
Explaination : sulphur dioxide and chlorine are used as bleaching agents. However Bleaching action of chlorine is based on oxidation while that of sulphur is based on reduction.
Sulphour dioxide is used as bleaching agent as it removes oxygen from the coloured substances and makes it colorless (Bleaching action). But atmospheric oxygen slowly occupies removed oxygen and the material regains the color.
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10Answer:
Bleaching by [tex]SO_2[/tex] is a reduction reaction
Explanation:
As a transient bleaching agent sulfur dioxide is utilized.
[tex]SO_2 +2H_2O[/tex] → [tex]H_2SO_4 +2[H](nascent)[/tex]
Color material +[H] → Colorless color (in presence of air)
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