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The standard electrode potentials E^(@) ...

The standard electrode potentials `E^(@)` for the half cell reactions are as :
`ZntoZn^(2+)+2e^(-),E^(@)=0.76V`
`FetoFe^(2+)+2e^(-),E^(@)=041V`
The EMF of the cell reaction `Fe^(2+)+ZntoZn^(2+)+Fe` is :

A

`Zn_((aq))^(+2)+2Ag_((s))to2Ag_((aq))^(+)+Zn_((s))`

B

`Zn_((s))+2Ag_((aq))^(+)toZn_((aq))^(+2)+2Ag_((s))`

C

`Az_((aq))^(2+)+Ag_((aq))^(+)toZn_((s))+Ag_((s))`

D

`Az_((s))+Ag_((s))toZn_((aq))^(+2)+Ag_((aq))^(+)`

Text Solution

Verified by Experts

The correct Answer is:
B
`Zn_((s))+2Ag_((aq))^(+)toZn_((aq))^(+2)+2Ag_((s))`
EMF for eq. (2) is +ve, and hence the relation is
`Zn_((s))+2Ag_((aq))^(+)toZn_((aq))^(+2)+2Ag_((s))`.
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