Question

Of the following metals, those that can not be obtained by electrolysis of the aqueous solution of their salts, are:

• A. $Ag$ and $Mg$
• B. $Ag$ and $Sn$
• C. $Mg$ and $Al$
• D. $Cu$ and $Cr$

Answer 1

The correct option is C $Mg$ and $Al$

$Mg$ and $Al$ have lower reduction potential than water. So water is reduced more easily to give $H_2$ gas at cathode.