Q. 13

<img width= A. ΔG value for the overall reduction reaction with carbon monoxide is zero.

B. ΔG value for the overall reduction reaction with a mixture of 1 mol carbon and 1 mol oxygen is positive.

C. ΔG value for the overall reduction reaction with a mixture of 2 mol carbon and 1 mol oxygen will be positive.

D. ΔG value for the overall reduction reaction with carbon monoxide is negative.

Answer :

The curve for oxidation of Fe to FeO and CO to CO2 meet at point D and have the same ΔG value.

2Fe+ O2 2FeO ---ΔG1


2CO + O2 2CO2 --- ΔG2


ΔG1 = ΔG2 because the curves meet at point D.


For reduction of FeO to Fe the sign of ΔG1 must be changed. It becomes - ΔG1. Now the overall ΔGr= - ΔG1 + ΔG2 =0

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