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How is the presence of SO_2 detected ? |
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Answer» Solution :`SO_2` is a pungent smelling gas. Following two tests can be performed to DETECT `SO_2` . (i) `SO_2` TURNS the pink violet COLOUR of `KMnO_4` solution to colourless due to reduction of `MnO_4^(-)` to `Mn^(2+)` ions.  (II) `SO_2` turns acidified `K_2Cr_2O_7` solution green dueto reduction of `Cr_2O_7^(2-)" to " Cr^(3+)` ions. 
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