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QUESTION
What is the oxidation number of S in H2SO3?
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##
