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Q.

When KMnO4 reacts with Br2 in alkaline medium gives bromate ion. Then oxidation state of Mn changes from +7 to

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a

+ 6

b

+3

c

+4

d

+2

answer is B.

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Detailed Solution

2Mn+7​O4−​+Br−+H2​O→2Mn+4​O2​+BrO3−​+2OH−

∴ Oxidation state changes to +4.

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When KMnO4 reacts with Br2 in alkaline medium gives bromate ion. Then oxidation state of Mn changes from +7 to