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How is the presence of SO(2) detected ?...

How is the presence of `SO_(2)` detected ?

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`SO_(2)` has a pungent odour `SO_(2)` presence can be detected by the following tests.
1. `SO_(2)` changes the colour of acidified potassium dichromate solution from orange to green.
`3"SO"_(2)+underset("orange")("Cr"_(2)"O"_(" "7)^(-2))+2"H"^(+)to3"SO"_(" "4)^(-2)underset("green")(+2"Cr"^(+3))+"H"_(2)"O"`
2. `SO_(2)` decolourises acidified `"KMnO"_(4)` solution.
`5"SO"_(2)+underset("Violet")(2"MnO"_(4)^(-))+2"H"_(2)"O"to5"SO"_(" "4)^(-2)+4"H"^(+)+underset("colour")(2"Mn"^(+2)`
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