JEE Main | 2014ElectrochemistryEasy
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-
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-Create a free account to view solution
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