Question

The electrolysis of aqueous solution of $CuB{r}_2$ using platinum electrode would lead to the evolving of
(1) $B{r}_2$ gas at anode
(2) $B{r}_2$ gas at anode and $O_2$ gas at cathode
(3) copper(s) at cathode
(4) $H_2$ gas at cathode

• A. 1, 2 and 3 are correct
• B. 1 and 2 are correct
• C. 2 and 4 are correct
• D. 1 and 3 are correct

Answer 1

Answer: (D)

$CuB{r}_2\to C{u}^{2+}+2B{r}^{-}$
At cathode $C{u}^{2+}+2e^{-}\to Cu(s)$
At anode $2B{r}^{-}\to B{r}_2+2e^{-}$