Question

Why is bleaching action of sulphur diaoxide temporary?

Answer 1

Sulphur dioxide bleaches by reduction. Presence of moisture is essential forbleaching. ... Bleaching by sulphur dioxide is temporary as atmospheric oxygen re-oxidizes the bleachedmatter after some time.

Answer 2

SO2 acts as a reducing agent and bleaches the substance by reduction, but when the substance again comes in contact with the atmosphere, it readily gets oxdised to the coloured compound.Hence the action of SO2 is temporary.


hope it help you ..

mark me brainliest...