Question

In the reaction
$3B{r}_2+6C{O}_3^{2-}+3H_{2}O\to 5B{r}^{\ominus }+Br{O}_3^{\ominus }+6HC{O}_3^{\ominus }$
(IIT-JEE, 1996)

• A. $B{r}_2$ is oxidised and $C{O}_3^{2-}$ is reduced.
• B. $B{r}_2$ is reduced and $H_{2}O$ is oxidised.
• C. $B{r}_2$ is neither reduced nor oxidised.
• D. $B{r}_2$ is both reduced and oxidised.

Answer 1

The correct option is D $B{r}_2$ is both reduced and oxidised.

It is a disproportionation reaction in which $B{r}_2$ is both reduced and oxidised. The oxidation state of C in both $C{O}_3^{2-}$ and $HC{O}_3^{\ominus }$ does not change.