Question

The oxidation state of $S$ in $H_2{S}_2{O}_8$ is :

Answer 1

S has electronic configuration of $1s^{2}2s^2{p}^{6}3s^{2}3p^4$.
It has $6$ valence electron so, maximum oxidation state can be $+6$.
Oxidation state of $S$ in $H_2{S}_2{O}_8$ is $6$.
The structure is given below: