Discussion Forum

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

Answer:

Explanation:

 Higher the position of element in the electrochemical series more difficult is the reduction of its cations.

If Ca²⁺ (aq)  is electrolysed, water is reduced in preference to it.  Hence, it  cannot be reduced electrolytically  from its aqueous solution 

$Ca^{2+}(aq)+H_{2}O\rightarrow Ca^{2+}+OH^{-}+H_{2}\uparrow$