A solution containing one mole per liter of each Cu(NO3)2; AgNO3; Hg2(NO3)2; Mg(NO3)2 is being electrolysed using inert electrodes. The values of standard electrode potentials (reduction potentials in volts are Ag/Ag+ = 0.80 V, 2Hg/ Hg2++ = 0.79 V, Cu/Cu++ = + 0.24 V, Mg/Mg++ - 2.37 V. With increasing volt age, the sequence of deposition of metals on the cathode will be
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Greater the value of standard reduction potential, greater will be it’s tendency to undergo reduction. So the sequence of deposition of metals on cathode will be Ag, Hg, Cu. Here magnesium will not be deposited because its’ standard reduction potential is negative. So it is strong tandency to undergo oxidation. Therefore, on electrolysis of Mg(NO 3 ) 2 solution, H 2 gas will be evolved at cathode.
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