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Potassium Permanganate

In neutral or...

Question

In neutral or faintly alkaline medium, thiosulphate is quantitatively oxidized by $K M n O_{4}$ to:

A

S O_{3}^{2 -}

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B

S O_{4}^{2 -}

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C

S O_{2}

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D

S O_{5}^{2 -}

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Solution

The correct option is A $S O_{4}^{2 -}$
The reaction between thiosulphate ion and KMnO $_{4}$ in neutral medium is given as:
8MnO $_{4}^{-}$ +3S $_{2} O_{3}^{2 -}$ +H $_{2}$ ) $\to$ 8MnO $_{2}$ + 6S $O_{4}^{2 -}$ +2OH $^{-}$

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