Which one of the following metals could not be obtained on electrolysis of aqueous solution of its salts?

During electrolysis,the species that becomes neutral at the cathode is ...... .

If the passage of current liberates $H_2$ at cathode and $Cl_2$ at anode then the solution is

$NaOH$ is manufactured by the electrolysis of a brine solution. The products of the reaction are:

Write the reactions for the following:
$A$. Electrolytic reaction of concentrated and dilute solution of $H_2SO_4$.
$B$. Oxidation reaction of $SO_4^{2-}$.

What happens to the $pH$ of the solution during the electrolysis of a dilute aqueous solution of $CuSO_4$ using inert electrodes?