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

$\begin{array}{1 1}(A)\;\text{Cu}\\(B)\;\text{Cr}\\(C)\;\text{Ag}\\(D)\;\text{Ca}\end{array}$

The metal that cannot be obtained by electrolysis of an aqueous solution of its salts is Ca.
Hence (D) is the correct answer.