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A solution containing 1 mol per litre o...

A solution containing `1 mol` per litre of each `Cu(NO_(3))_(2), AgNO_(3),` and` Hg_(2)(NO_(3))_(2)` is being electrolyzed by using inert electrodes. The values of standard electrode potentials in volts `(` reduction potential `)` are
`Ag|Ag^(o+)=+0.80, 2Hg|Hg_(2)^(2+)=+0.79`
`Cu|Cu^(2+)=+0.34,Mg|Mg^(2+)=-2.37`.
With increasing voltage, the sequence of deposition of metals at the cathode will be

A

`Ag,Hg,Cu,Mg`

B

`Mg,Cu,Hg,Ag`

C

`Ag,Hg,Cu`

D

`Cu,Hg,Ag`

Text Solution

Verified by Experts

The correct Answer is:
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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