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

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Solution

In neutral or faintly alkaline medium

$8 M n O_{4}^{-} + 3 S_{2} O_{3}^{2 -} + H_{2} O \to 8 M n O_{2} + 6 S O_{4}^{2 -} A () + 2 O H^{-}$

A is $S O_{4}^{2 -}$ .
The oxidation state of sulphur in A is :
$x - 8 = - 2 x = + 6$

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