Question

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

• A. Ag
• B. Ca
• C. Cu
• D. Cr

Answer 1

The correct option is B

Ca

Higher the position of element in the electrochemical series, more difficult is the reduction of its cation. If $C{a}^{2+}$ (aq) is electrolysed, water is reduced in preference to it. Hence, it cannot be reduced electrolytically from its aqueous solution to get calcium metal.

$C{a}^{2+}\left(aq\right)+H_{2}O⟶C{a}^{2+}+O{H}^{-}+H_2\uparrow$