A solution containing one mole per litre each of `Cu(NO_(3))_(2),AgNO_(3),Hg(NO_(3))_(2)` and `Mg(NO_(3))_(2)` is being electrolysed by using inerty electrodes. The values of the standard oxidation potentials in vlts are `Ag//Ag^(+)=-0.8V,Ag//Hg^(2+)=-79V,Cu//Cu^(2+)=-0.34V,Mg//Mg^(2+)=2.37V`. The order in which metals will be formed at cathode will be-

Options

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

Answer

C

Explanation

Metal having more value of SRP will deposit first, but Mg does not deposition aqueous solution.