Question:
In mildly alkaline medium, thiosulphate ion is oxidized by $\mathrm{MnO}_{4}^{-}$to "A". The oxidation state of sulphur in "A" is
Solution:
(6)
$\mathrm{S}_{2} \mathrm{O}_{3}^{2-}+\mathrm{MnO}_{4}^{-} \frac{\text { Alkaliue }}{\text { Melium }} \mathrm{A}$
$A \rightarrow S O_{4}^{-2}$
$\therefore$ Oxidation no. of 'S' $=+6$ Ans.