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Question

Given, E0Fe3+/Fe=0.036 V,E0Fe2+/Fe=0.439 V. The value of standard electrode potential for the change, Fe3+(aq)+eFe2+(aq) will be :

A
0.403 V
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B
0.385 V
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C
0.986 V
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D
0.270 V
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Solution

The correct option is C 0.986 V
Fe3++3eFe,E01=0.036 V
Fe2++2eFe,E02=0.439 V
Fe3+(aq)+eFe2+(aq);E0n=?
ΔG is an additive property:
ΔG0n=ΔG01+ΔG02
Here,
ΔG0n=ΔG01ΔG02
ΔG0=nFE0
Now,
nnFE0n=n1FE01+n2FE02
E0n=3×(0.036)2×(0.439)1=0.986 V

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