ElectrochemistryHard

Question

A solution containing 1.0 M each of Cu(NO3)2, Mg(NO3)2, AgNO3, Hg(NO3)2 is being electrolysed using inert electrodes. The values of standard electrode potential are: Ag+|Ag = 0.80 V, Hg2+|Hg = 0.79 V, Cu2+|Cu = 0.34 V, Mg2+|Mg = − 2.37 V. With increasing voltage, the sequence of deposit of metals on the cathode will be

Options

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

Solution

Reduction occur first for the species having higher reduction potential.

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