ElectrochemistryHard

Question

A solution containing one mol per litre each of Cu(NO3)2, AgNO3, Hg(NO3)2 and Mg(NO3)2 is being electrolysed by using inert electrodes. The values of the standard oxidation potentials in volts are Ag/Ag+ = - 0.8 V ; Hg/Hg2+ = - 0.79 V; Cu/Cu2+ = - 0.34 V ; Mg/Mg2+ = 2.37 V. The order in which metals will be formed at cathode will be -

Options

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

Solution

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

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