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The oxidation number of ##"S"## in ##"H"_2"SO"_3## is ##+4##

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The oxidation number of ##"S"## in ##"H"_2"SO"_3## is ##+4##.

##"H"_2"SO"_3##

There is no charge on the compound

##2"H" + "S" + 3"O" = 0 ##

##2(+1) + "S" +3(-2) =0 ##

##+2 + "S" - 6 = 0##

##"S" -4 =0##

##"S" = +4##