Given, E0Fe3+/Fe=0.036V,E0Fe2+/Fe=−0.439V. The value of standard electrode potential for the change, Fe3+(aq)+e−→Fe2+(aq) will be :
A
−0.403V
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B
0.385V
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C
0.986V
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D
−0.270V
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Solution
The correct option is C0.986V Fe3++3e−→Fe,E01=0.036V Fe2++2e−→Fe,E02=−0.439V Fe3+(aq)+e−→Fe2+(aq);E0n=? ΔG is an additive property: ΔG0n=ΔG01+ΔG02
Here, ∴ΔG0n=ΔG01−ΔG02 ΔG0=−nFE0
Now, −nnFE0n=−n1FE01+n2FE02 ∴E0n=3×(0.036)−2×(−0.439)1=0.986V