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An aqueous solution containing one mole ...

An aqueous solution containing one mole per litre of each `Cu(NO_3)_2 , AgNO_3 . Hg(NO_3)_(2), Mg(NO_3)_2` is being electrolysed using inert electrodes. The values of standard electrode potential (reduction potential) in volts are
`Ag//Ag^(+) = + 0.80 V " "Hg//Hg^(2+) = + 0.79V " " Cu//Cu^(2+) = +0.34 V " " Mg//Mg^(2+) = -2.37 V `
With increasing voltage, the sequence of deposition of metals on cathode will be

A

Ag , Hg , Cu ,Mg

B

Mg , Cu , Hg , Ag

C

`Ag , Hg , Cu , H_2`

D

`Cu , Hg , Ag `

Text Solution

Verified by Experts

The correct Answer is:
C
`Ag//Ag^(+) = 0.80 V , Hg//Hg^(+) = 0.79 V , Cu//Cu^(+2) = 0.34 V , Mg//Mg^(+2) = 2.37 V `
Higher reaction potential , Metal deposits more at cathode
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