An aqueous solution containing one mole per litre of each `Cu(NO_(3))_(2), AgNO_(3),Hg(NO_(3))_(2)` is being electrolysed using inert electrodes. The values of standard electrdoe potential in volts (reduction potential) are `Ag|Ag^(+)=+0.80 2Hg|Hg^(2+)=+0.79` `Cu|Cu^(2+)=+0.34 Mg|Mg^(2+)=-2.37` With increasing voltage, the sequence of deposition of metals on cathode will beA. `Ag,Hg,Cu,Mg`B. `Mg,Cu,Hg,Ag`C. `Ag,Hg,Cu`D. `Cu,Hg,Ag`

An aqueous solution containing one mole per litre of each `Cu(NO_(3))_

1.	An aqueous solution containing one mole per litre of each `Cu(NO_(3))_(2), AgNO_(3),Hg(NO_(3))_(2)` is being electrolysed using inert electrodes. The values of standard electrdoe potential in volts (reduction potential) are `Ag\|Ag^(+)=+0.80 2Hg\|Hg^(2+)=+0.79` `Cu\|Cu^(2+)=+0.34 Mg\|Mg^(2+)=-2.37` With increasing voltage, the sequence of deposition of metals on cathode will beA. `Ag,Hg,Cu,Mg`B. `Mg,Cu,Hg,Ag`C. `Ag,Hg,Cu`D. `Cu,Hg,Ag`
Answer» Correct Answer - C Higher the reduction potential easier to reduce. From an aqueous situation Mg cannot be obtained by electrolysis. Therefore, correct order of depositions as voltage is increased is Ag,Hg, Cu.

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What are elementary reactions ?

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