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An aqueous solution containing one mole ...

An aqueous solution containing one mole per litre of `Cu(NO_3)_2 , AgNO_(3),Hg(NO_3)_2` and `Mg(NO_3)_2` is being electrolysed using inert electrodes. The values of the standard electrode potentials in volts (reduction potientials) 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 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
`rho = R.(a)/(l) = (25 xx 3.2)/(1.6) =50 ` ohm cm
`K = (1)/(rho) = (1)/(50) =0.02 S cm^(-1)`
`Lambda_(eq) = K xx V = K xx (1000)/("Normality")= (0.02 xx 1000)/(0.5)`
`=40 s cm^2 ` equiv.
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