The metal that cannot obtained by electrolysis of an aqueous solution of its salts is `:`

Options

A. Ag
B. Ca
C. Cu
D. Cr

Answer

B

Explanation

Higher the position of element in the electrochemical series, more difficult is the reduction of its cations.
If `Ca^(2+)` (aq) is electrolysed, water is reduced in preference to it. Hence it cannot be reduced electrolytically from an aqueous solution.