(B) Let the oxidation number of sulphur be $x$.In the thiosulphate ion,$S_2O_3^{2-}$,the sum of the oxidation numbers of all atoms equals the charge o

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(B) Let the oxidation number of sulphur be $x$.In the thiosulphate ion,$S_2O_3^{2-}$,the sum of the oxidation numbers of all atoms equals the charge on the ion.$2x + 3(-2) = -2$$2x - 6 = -2$$2x = +4$$x = +2$Therefore,the average oxidation number of sulphur in $S_2O_3^{2-}$ is $+2$.