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The standard reduction potential for Fe^...

The standard reduction potential for `Fe^(2+) //Fe` and `Sn^(2+) //Sn` electrodes are `-0.44` and `-0.14 ` volt respectively. For the given cell reaction `Fe^(2+) + Sn rarr Fe + Sn^(2+) `, the standard ` EMF` is.

A

`+0.30 V`

B

`0.42 V`

C

`-1.1 V`

D

`-0.42` V

Text Solution

Verified by Experts

The correct Answer is:
D
For the cell reaction, Fe acts as cathode and Sn as anode. Hence,
`E_("cell")^(@) = E_("cathode")^(@) - E_("anode")^(@) = -0.44 - (-0.14) = -0.30 V`
The negative EMF suggests that the reaction goes spontaneously in reverse direction.
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