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Q.

In the neutral or faintly alkaline medium, KMnO4 oxidises iodide into iodate. The change in oxidation state of manganese in this reaction is from

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a

+6 to +5

b

+7 to +4

c

+7 to +3

d

+6 to +4

answer is D.

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Detailed Solution

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 A notable reaction is the oxidation of iodide to iodate:

 2MnO4 + H2O + I —> 2MnO2 + 2OH + IO3

In faintly alkaline medium KMnO4 will be reduced to MnO2, therefore change in oxidation state will be +7 to +4.

 

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