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Question

The half cell reactions for rusting of iron are :


2H++12O2+2eH2O ; Eo=1.23 V
Fe2++2eFe ; Eo=0.44 V

ΔGo (in kJ) for the complete cell reaction is :

A
-76.23
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B
-152.47
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C
-228.9
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D
-176.4
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Solution

The correct option is B -152.47
EoCell=1.230.44=0.79 V

No. of electrons involved in the given cell is 2. So, n-2.

ΔGo=nFEOCell

ΔGo=2×96500×0.79 J

ΔGo=152470 J

ΔGo=152.47 kJ

Hence, Option "B" is the correct answer.

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