A solution containing one mole per litre each of `AX, BX_(2), CX_(2)` and `DX_(2)` is electrolysed using inert electrodes. The values of the standard potentials for reduction reactions of `A^(+)|A, B^(2+)|B,C^(2+)|C` and `D^(2+)|D` are `+.80, +.34, -0.76` and `-1.66` volts respectively. The correct sequence in which these metals will be deposited on the cathode is :

A solution containing one mole per litre each of Cu(NO_3)_2, AgNO_3, Hg_2(NO_3)_2 and Mg (NO_3)_2 is being electrolysed by using inert electrodes. The values of standard electrode potentials in volt (reduction potentials) are, Ag|Ag^+ =0.80.2Hg|Hg_2^(2+) =0.79,Cu|Cu^(2+)=+0.34 and Mg^(2+)=-2.37 With increasign voltage, the sequence of deposition of metals on the cathode will be :

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-