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

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answer is B.

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Detailed Solution

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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