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# How is the presence of SO2 detected ?

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

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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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