Question

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

• A. bromine is oxidized and carbonate is reduced
  
• B. bromine is oxidized
  
• C. bromine is reduced
  
• D. It is a disproportionation reaction

Answer 1

Answer: (B), (C), (D)

It is a disproportionation reaction

The given reaction is a disproportionation reaction.
The reactions in which single reactant is oxidized and reduced is known as Disproporionation reactions.
In the given reaction $B{r}_2$ molecule undergoes both oxidation and reduction.
Oxidation reaction of Br
$B{r}_2\to Br{O}_3^{-}$
Here oxidation state of Br change fom 0 to +5.

Reduction reaction of Br
$B{r}_2\to B{r}^{-}$
Here oxidation state of Br change fom 0 to -1.

The carbon in carbonate is not reduce or oxidised in the given reaction.

Thus (b), (c) and (d) are correct