Determine the oxidation number of the marked elements in the following componds
`H_(2)overset(**)S_(2)O_(8)`

Explanation

`H_(2)overset(**)S_(2)O_(8):HO-underset(O)underset(||)overset(O)overset(||)(S)-O-O-underset(O)underset(||)overset(O)overset(||)(S)-OH`
Let the oxidation of S in `H_(2)S_(2)O_(8) be =x.`
`underset(("For two H-atoms"))(2xx(+1)+2xx)underset(("ForO-O"))(x+2xx(-1))underset(("For rest six O-atoms"))(+6xx(-2)=0)`,
or,2x-12=0 `therefore` x=+6 So, the oxidation number S in `H_(2)S_(2)O_(8)` is +6.