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Bleaching action of SO 2 is: A) permanent, reduction B) temporary, reduction C) permanent, oxidation D) temporary, oxidation

Bleaching action of SO2  is:
A) permanent, reduction
B) temporary, reduction 
C) permanent, oxidation 
D) temporary, oxidation

Grade:12th pass

2 Answers

Saurabh Koranglekar
askIITians Faculty 10341 Points
one year ago
Dear student

The answer is B) temporary, reduction

Regards
Vikas TU
14149 Points
one year ago
Dear student 
Sulphur dioxide is a temporary bleaching agent, unlike Chlorine, which is a permanent bleaching agent! This is because the mechanism for bleaching is different:
SO2-Reduction => TEMPORARY
Cl2-Oxidation => PERMANENT
Sulphur 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.

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