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  4. In neutral or faintly alkaline medium, KMnO 4 being a powerful oxidant can oxidize, thiosulphate almost quantitatively, to sulphate. In this reaction overall change in oxidation state of manganese will be :

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Q. In neutral or faintly alkaline medium, $KMnO _4$ being a powerful oxidant can oxidize, thiosulphate almost quantitatively, to sulphate. In this reaction overall change in oxidation state of manganese will be :

JEE MainJEE Main 2022The d-and f-Block Elements

Solution:

$8 \overset{+7}{M}nO _4^-+3 S _2 O _3{ }^{2-}+ H _2 O \rightarrow 8 \overset{+4}{M}nO _2+6 SO _4{ }^{2-}+2 OH ^{-}$
Change in oxidation state of $Mn$ is from $+7$ to $+4$ which is 3 .