In mildly alkaline medium, thiosulphate ion is oxidized by $\mathrm{MnO}_4^{-}$to " A ". The oxidation state of sulphur in " A " is $\_\_\_\_$ .
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Solution
$$
\mathrm{MnO}_4^{-}+\mathrm{S}_2 \mathrm{O}_3^{2-} \rightarrow \stackrel{+4}{\mathrm{M}} \mathrm{nO}_2+\underset{(\mathrm{A})_4}{\mathrm{SO}^{2-}}
$$
Oxidation state of ' S ' in $\mathrm{SO}_4^{2-}$
$$
=+6
$$
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