In a mildly alkaline medium, thiosulphate ion is oxidized by $K M n O_{4}$ to "A". The oxidation state of sulphur in "A" is:

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Solution

In a mildly alkaline medium, thiosuphate is quantitavely oxidized by $K M n O_{4}$ to $S O_{4}^{2 -}$
$8 M n O_{4}^{-} + 3 S_{2} O_{3}^{2 -} + H_{2} O \to 8 M n O_{2} + 6 S O_{4}^{2 -} + 2 O H^{-}$

"A" $\to S O_{4}^{2 -}$

Oxidation number of $^{'} S^{'} = + 6$ .

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