JEE Main | 2014ElectrochemistryHard

Question

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

Options

A.Ag
B.Ca
C.Cu
D.Cr

Solution

On electrolysis only in case of Ca2+ salt aqueous solution H2 gas discharge at Cathode.
Case of Cr
At cathode : Cr3+ + 2e- → Cr
So, Cr is deposited.
Case of Ag
At cathode : Ag+ + e- → Ag
So, Ag is deposited.
Case of Cu
At cathode : Cu2+ + 2e- → Cu
Case of Ca2+
At cathode : H2O + e- → H2 + OH-

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