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The standard reductino potentials E^(c-)...

The standard reductino potentials `E^(c-)` for the half reactinos are as follows`:`
`ZnrarrZn^(2+)+2e^(-)" "E^(c-)=+0.76V`
`FerarrFe^(2+)+2e^(-) " "E^(c-)=0.41V`
The `EMF` for the cell reaction
`Fe^(2+)+Znrarr Zn^(2+)+Fe`
is

A

`(-0.35V)`

B

`(+0.35V)`

C

`(+1.17V)`

D

`(-1.17V)`

Text Solution

Verified by Experts

(i) In a galvanic cell, oxiddation occurs at anode and reduction at cathode.
(ii)Oxidation occurs at electrode having higher oxidation potential and it behave as anode and other electrode acts as cathode.
(iii) `E_(cell=E_(c)-E_A`
(Subsitute reduction potenrial at both places).
`Fe^(2+)+Znto Zn^(2+)+Fe`
Q `Zn to Zn ^(++)+2e^(-) and Fe^(2+)2e^(-)toFe therefore` Zn is anode Fe is cathode.
`E_(cell)=E_c-E_A=-0.41-(-0.76)=0.35V`
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