1.

In which of the following reactions, SO_(2) acts as an oxidising agent?

Answer»

`I_(2)+SO_(2) +2H_(2)O to SO_(4)^(2-)+4H^(+)+2I^(-)`
`SO_(2)+2H_(2)S to 3S+2H_(2)O`
`3Fe+SO_(2) to FES+2FeO`
`K_(2)Cr_(2)O_(7)+3SO_(2)+H_(2)SO_(4) to Cr_(2)(SO_(4))_(3)+K_(2)SO_(4) +H_(2)O`

Solution :`SO_(2)` oxidizes metals and `H_(2)S. , SO_(2)+H_(2)S^(-2) to 2H_(2)O +3 overset(O)S, 3overset(O)Fe+SO_(2) to 2overset(+2)(FeO)+overset(+2)(FeS)`


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