In the neutral or faintly alkaline medium oxidises iodide into iodate. The change in oxidation state of manganese in this reaction is from [2022]

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Solution

Q.
In the neutral or faintly alkaline medium ${KMnO}_{4}$ oxidises iodide into iodate. The change in oxidation state of manganese in this reaction is from [2022]

1 +7 to +4

2 +6 to +4

3 +7 to +3

4 +6 to +5

Ans.
(1)

Reaction of ${MnO}_{4}^{-}$ with $I^{-}$ in neutral or faintly alkaline solution:

$\begin{array}{rcl} \overset{+ 7}{2 {MnO}_{4}^{-}} + H_{2} O + \overset{- 1}{I^{-}} ⟶ \overset{+ 4}{2 {MnO}_{2}} + 2 {OH}^{-} + \overset{+ 5}{{IO}_{3}^{-}} \end{array}$

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