Question

From the following the metals that cannot be obtained by electrolysis of the aqueous solution of their salts are :

• A. $Ag$
• B. $Cu$
• C. $Mg$
• D. $Al$

Answer 1

The correct option is C $Mg$

Na can not be obtained by electrolysis of the aqueous solution of salt as hydrogen ions have higher reduction potential than $N{a}^{+}$ so hydrogen ions will reduce first and we will get hydrogen gas instead of Na metal by electrolysis of the aqueous solution.