Question
The metal that cannot be obtained by electrolysis of an aqueous solution of its salts is
-
Ag
-
Ca
-
Cu
-
Cr
Solution
C.
Cu
Higher the position of the element in electrochemical series more difficult is the reduction of its cations.
If Ca2+ (aq) is electrolyzed, water is reduced in preference to it. Hence, It cannot be reduced electrically from their aqueous solution.
Ca2+ (aq) + H2O → Ca2+ +OH- +H2
