Q77 / 180 · AIIMS 2011 · Chemistry
When $\mathrm{KMnO}_4$ reacts with $\mathrm{KBr}$ in alkaline medium gives bromate ion. Then oxidation state of Mn changes from +7 to
- A+6
- Correct answerB+4
- C+3
- D+2
Solution
$: 2 \mathrm{MnO}_4^{-}+\mathrm{Br}^{-}+\mathrm{H}_2 \mathrm{O} \longrightarrow$
$$
2 \stackrel{+4}{\mathrm{MnO}_2}+\mathrm{BrO}_3^{-}+2 \mathrm{OH}^{-}
$$
Hence, the correct answer is option: 'B'.