Question

Find the sum of average oxidation number of $S$ in $H_{2}S{O}_5$ (peroxy monosulphuric acid) and $N{a}_2{S}_2{O}_3$ (sodium thiosulphate).

Answer 1

In $H_{2}S{O}_5$ oxidation number of sulphur is (+6) and in $N{a}_2{S}_2{O}_3$ oxidation number of one sulphur is (-2), and another sulphur has (+6) oxidation number.

So sum of average oxidation number is = 6+(6-2)/2 =(+8)