7.22     How is the presence of  SO_{2}  detected ?

Answers (1)

Presence of sulphur dioxide is measured by the following reaction. it decolourises acidified potassium permanganate(VII) solution.

5SO_2+2MnO_4^-+2H_2O\rightarrow 5SO_4^{2-}+4H^++2Mn^{2+}.

it decolourises acidified potassium permanganate(VII) solution.

Hence This can be used to detect the presence of SO_{2}.

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