An aqueous solution containing one mole per litre of each $$Cu(NO3)2$$, $$AgNO3$$. $$Hg(NO3)2$$, $$Mg(NO3)2$$ is being electrolysed using inert electrodes. The values of standard electrode potential in volts (reduction$$ $$potential) areAg $$/$$ $$Ag+$$ $$=$$ $$+$$ $$0.80V$$ $$Hg2+$$ $$/$$ Hg $$=$$ $$+$$ $$0.79VCu2+$$ $$/$$ Cu $$=$$ $$+$$ $$0.34V$$ $$Mg2+$$ $$/$$ Mg $$=$$ – $$2.37VWith$$ increasing voltage, the sequence of deposition of metals on cathode will be

Question

An aqueous solution containing one mole per litre of each $$Cu(NO3)2$$, $$AgNO3$$. $$Hg(NO3)2$$, $$Mg(NO3)2$$ is being electrolysed using inert electrodes. The values of standard electrode potential in volts (reduction$$ $$potential) areAg $$/$$ $$Ag+$$ $$=$$ $$+$$ $$0.80V$$  $$Hg2+$$ $$/$$ Hg $$=$$ $$+$$ $$0.79VCu2+$$ $$/$$ Cu $$=$$ $$+$$ $$0.34V$$  $$Mg2+$$ $$/$$ Mg $$=$$ – $$2.37VWith$$ increasing voltage, the sequence of deposition of metals on cathode will be

Infinity Learn · Accepted Answer

At Cathode higher reduction potential is reduced first.Mg reduces all the three metals because it is having lowest SRP.Cu reduces $$Hg2+$$ to Hg and also reduces $$Ag+$$ to Ag.Hg reduces only $$Ag+$$ to Ag.$$Mg2+$$ is not reduced because there is no element given with lower SRP.Order of deposition is Cu < Hg < Ag.

Q.

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