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Question

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


  1. Cu

  2. Cr

  3. Ag

  4. Ca


Solution

The correct option is D

Ca


Higher the position of element in the electrochemical series, more difficult is the reduction of its cation. If Ca2+ (aq) is electrolysed, water is reduced in preference to it. Hence, it cannot be reduced electrolytically from its aqueous solution to get calcium metal.

Ca2+(aq)+H2OCa2++OH+H2

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