Oxi. state of sulphur in ${S_2}O_4^{2 - } = + 3$
Oxi. state of sulphur in $SO_3^{2 - } = + 4$
Oxi state of sulphur in ${S_2}O_6^{2 - } = + 5$.
$CH_4\, _{( g )}+4 Cl _{2}\,_{( g )} \rightarrow CCl _{4}\,_{( l )}+4 HCl\,_ {( g )}$