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

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+ 6

answer is B.

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Detailed Solution

2 $\overset{+ 7 }{Mn}$ O₄⁻+Br⁻+H₂O→2 $\overset{+ 4 }{Mn}$ O₂+BrO₃⁻+2OH⁻

∴ Oxidation state changes to +4.

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