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  • Choose the correct option of temperature at which carbon reduces \text {FeO} to iron and produces \text {CO}. (i) Below temperature at point A. (ii) Approximately at the temperature corresponding to point A.

Answer the questions 11-13 on the basis of Fig. 6.1.

Choose the correct option of temperature at which carbon reduces \text {FeO} to iron and produces \text {CO}.

(i) Below temperature at point A.

(ii) Approximately at the temperature corresponding to point A.

(iii) Above temperature at point A but below a temperature at point D.

(iv) Above temperature at point A.

Answers (1)

The answer is the option (iv) \text {FeO+C}\rightarrow \text {Fe+CO}

It can be seen as a couple of two simpler reactions

\text {FeO}\rightarrow \text {Fe+}\frac{1}{2}\text {O}_{2}(\Delta \text {G}^{0}_{FeO.Fe})

\text {C+}\frac{1}{2}\text {O}_{2}\rightarrow \text {CO}(\Delta \text {G}^{0}_{C.CO})

Total Gibbs energy change becomes  \Delta \text {G}^{0}_{C.CO}+\Delta\text {G}_{FeO.Fe}^{0}

 In \Delta \text {G}^{0} versus T plot, the plot \text {Fe} to \text {FeO} goes upward and the plot for \text {C} to \text {CO} goes downwards.

At temperature above point A, the \text {C} to \text {CO}  lines comes below \text {Fe} to \text {FeO} and \Delta \text {G}^{0}_{C,CO} < \Delta \text {G}^{0}_{Fe, FeO}

So in this range, \text {C} will reduce \text {FeO} to \text {Fe}  and itself be oxidised to \text {CO}.

 

 

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infoexpert23

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