Question

The products formed when an aqueous solution of $NaBr$ is electrolysed in a cell having inert electrodes are

• A. $Na$ and $Br _{2}$
• B. $Na$ and $O _{2}$
• C. $H _{2}, Br _{2}$ and $NaOH$
• D. $H _{2}$ and $O _{2}$

Answer 1

Answer: (C)

$NaBr \rightleftharpoons Na ^{+}+ Br ^{-}$

$ Br ^{-}- e ^{-} \longrightarrow Br $
$ Br + Br \longrightarrow Br _{2}$ (at anode)
So, the products are $H _{2}, Br _{2}$ and $NaOH . H _{2}$ at cathode, $Br _{2}$ at anode and $NaOH$ in solution.