General Principles And Processes of Isolation Of Elements

General Principles And Processes of Isolation Of Elements

Question

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

  • Ag

  • Ca

  • Cu

  • Cr

Answer

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

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