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  • In neutral or faintly alkaline medium, being a powerful oxi

In neutral or faintly alkaline medium, \mathrm{\mathrm{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 :

Option: 1

5


Option: 2

1


Option: 3

0


Option: 4

3


Answers (1)

best_answer

The reaction will be -

\mathrm{8MnO_{4}^{-}+3S_{2}O_{3}^{2-}+H_{2}O\longrightarrow 8MnO_{2} +6SO_{4}^{2-}+2OH^{-}}

So change in oxidation state of \mathrm{Mn} will be -
\mathrm{+7\left ( MnO_{4}^{-} \right )\longrightarrow +4\left ( MnO_{4} \right ) }
\mathrm{Change= 7-4= 3 }
Option (4) is correct.

Posted by

Ritika Harsh

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