TEST--54--XII [electro-]

Q.12.- A solution containing one mole for litre each of Cu(NO3)2, AgNO3, Hg2(NO3)2 and Mg(NO3)2 is electrolysed using inert electrodes.
Standard electrode potentials in volts (reduction potentials) are:

Ag⁺| Ag = 0.80
Hg2²⁺ |Hg = 0.79
Cu²⁺|Cu = 0.34
Mg²⁺|Mg = -2.37

With increasing voltage, the sequence of deposition of metals on the cathode will be:


a. Ag,Hg,Cu, Mg
b. Mg,Cu,Hg,Ag
c. Ag,Hg, Cu
d. Cu,Hg, Ag