Question

Electric current is passed through an aqueous solution of lithium bromide. What is the product at the cathode and anode respectively?

• A. Cathode - Lithium, Anode - bromine
• B. Cathode - bromine, Anode- lithium
• C. Cathode - Lithium, Anode- lithium
• D. Cathode - bromine, Anode- bromine

Answer 1

The correct option is A Cathode - Lithium, Anode - bromine

In Lithium Bromide, lithium exists as $L{i}^{+}$ and bromine as $B{r}^{-}$.
$L{i}^{+}$reduces to Li and
$B{r}^{-}$oxidizes to Br

Reactions are as follows
$L{i}^{+}+e^{-}\to Li$ (reduction)
$2B{r}^{-}\to B{r}_2+2e^{-}$ (oxidation)
Electrode at which oxidation happens is the anode whereas that where reduction happens is cathode.
Lithium is produced at the cathode and bromine is produced at the anode.