Extraction of Metals - Result Question 21

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

(2014 Main)

(a) Ag

(b) Ca

(c) Cu

(d) Cr

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Solution:

  1. 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 their aqueous solution.

Ca2+(aq)+H2O⟶Ca2++OH−+H2↑

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