Identify the elements undergoing reduction and oxidation respectively in the following redox reaction. $3…
Identify the elements undergoing reduction and oxidation respectively in the following redox reaction.
$3 \mathrm{H}_3 \mathrm{AsO}_{3(\mathrm{aq})}+\mathrm{BrO}_{3(\mathrm{aq})}^{-} \rightarrow \mathrm{Br}_{(\mathrm{aq})}^{-}+3 \mathrm{H}_3 \mathrm{AsO}_4$
As and $\mathrm{O}$
$\mathrm{Br}$ and $\mathrm{As}$
$\mathrm{As}$ and $\mathrm{Br}$
$\mathrm{Br}$ and $\mathrm{O}$
Solution
The oxidation number of $\mathrm{Br}$ decreases from +5 . to -1 and that of As increasés from +3 to +5 . Hence, $\mathrm{Br}$ undergoes reduction and $\mathrm{As}$ undergoes oxidation.