In the reaction: \[3Br\_{2} + 6CO\_{3}^{2 -} + 3H\_{2}O \ri... | CHEMISTRY - OXIDATION NUMBER | SolveeIt | Solveeit

Today, August 18

Question

In the reaction:

$3Br_{2} + 6CO_{3}^{2 -} + 3H_{2}O \rightarrow 5Br^{-} + BrO_{3}^{-} + 6HCO_{3}^{-}$

A

Bromine is reduced and carbonate ion is oxidised.

B

Bromine undergoes disproportionation.

C

Bromine is reduced and water is oxidised.

D

Only water is oxidised to carbonic acid.

Answer

Bromine undergoes disproportionation.

Explanation

Solution

$3Br_{2} + 6CO_{3}^{2 -} + 3H_{2}O \rightarrow 5Br^{-} + BrO_{3}^{-} + 6HCO_{3}^{-}$

Here $Br_{2}$ is both reduced and oxidised.

$Br_{2}(0) \rightarrow Br^{-}( - 1)$ (reduction)

$Br_{2}(0) \rightarrow BrO_{3}^{-}( + 5)$ (oxidation)