Question

In which of the following electrolysis in aqueous medium, mass of anode decreases and `pH` of solution remains unchanged?
A. Electrolysis of aqueous `AgNO_(3)` using silver anode and copper cathode
B. Electrolysis of aqeous `CuSO_(4)` using pure copper anode and impure copper cathode.
C. Electrolysis of aqeous `AgNO_(3)` using gold anode and silver cathode
D. Electrolysis of aqeous `CuSO_(4)` using silver anode and platium cathode.

Answer 1

Correct Answer - A::B::D
Anode: (A) `AgrarrAg^(+)+e^(-)`,(B) `CurarrCu^(2+)+2e^(-)`,
(C) `AgrarrAg^(+)+e^(-)`
(D) `2H_(2)OrarrO_(2)+4H^(+)+4e^(-)`
Cathode: (A) `Ag^(+)+e^(-)rarrAg`
(B) `Cu^(2+)+2e^(-)rarrCu`
(C) `Cu^(2+)+2e^(-)rarrCu`
(D) `Ag^(+)+e^(-)rarrAg`