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The standard reduction potential E^(@), ...

The standard reduction potential `E^(@)`, for the half reaction are :
`{:(Zn rarr Zn^(2+) + 2e^(-),,,E^(@) = 0.76 V),(Cu rarr Cu^(2+) + 2e^(-),,,E^(@) = 0.34 V):}`
The emf for the cell reaction, `Zn(s)+Cu^(2+) rarr Zn^(2+) + Cu(s)` is :

A

`0.42 V`

B

`-0.42 V`

C

`-1.1 V`

D

`+1.1 V`

Text Solution

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The correct Answer is:
D
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The standard oxidation potential E^@ for the half cell reaction are Zn rarr Zn^2+2e^- E^@=+ 0.76 V Fe rarr Fe^2+ + 2e^- E^@=+ 0.41 V EMF of the cell rection is Zn+Fe^(2+) rarr Zn^(2+)+Fe

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