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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 A.

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Detailed Solution

Reaction of MnO4− with I- in neutral or faintly alkaline solution:

2MnO4−+7         +H2O+I−−1 →2MnO2+4     +2OH−+IO3−+5   

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