A solution containing `1 mol` per litre of each `Cu(NO_(3))_(2), AgNO_(3),` and` Hg_(2)(NO_(3))_(2)` is being electrolyzed by using inert electrodes. The values of standard electrode potentials in volts `(` reduction potential `)` are
`Ag|Ag^(o+)=+0.80, 2Hg|Hg_(2)^(2+)=+0.79`
`Cu|Cu^(2+)=+0.34,Mg|Mg^(2+)=-2.37`.
With increasing voltage, the sequence of deposition of metals at the cathode will be
A. Ag,Hg,Cu,Mg
B. Mg,Cu,Hg,Ag
C. Ag,Hg,Cu
D. Cu,Hg,Ag
