Answer
$2MnO_{4}^{-} (aq) + Br^{-}(aq) +H_{2}O (l) → BrO_{3}^{-}(aq) + 2MnO_{2}(s) + 2OH^{-}(aq)$
Work Step by Step
Since the reaction is in basic medium, we add water to the left hand side and OH- to the right hand side of the equation.
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