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

Options

A. Ag, Hg, Cu, Mg
B. Mg, Cu, Hg, Ag
C. Ag, Hg, Cu
D. Cu, Hg, Ag

Explanation

The reduction potentials (as given) of the ions are in order :
`Ag^(+)gt Hg_2^(2+)gt Cu^(2+)gtM g^(2+)`
`M g^(2+)(aq)` will not be deposition of the metals will be Ag, Hg, Cu