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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