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प्रश्न
Choose the correct option of temperature at which carbon reduces \[\ce{FeO}\] to iron and produces \[\ce{CO}\].
पर्याय
Below temperature at point A.
Approximately at the temperature corresponding to point A.
Above temperature at point A but below temperature at point D.
Above temperature at point A.
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उत्तर
Above temperature at point A.
Explanation:
\[\ce{FeO + C -> Fe + CO}\]
It can be seen as a couple of two simpler reactions:
\[\ce{FeO -> Fe + 1/2 O2 (ΔG^Θ_{FeO, Fe})}\]
\[\ce{C + 1/2 O2 -> CO (ΔG^Θ_{C, CO})}\]
Total Gibb's energy change becomes
\[\ce{ΔG^Θ_{(C, CO)} + ΔG^Θ_{(FeO, Fe)} ΔrG^Θ}\]
In \[\ce{ΔG^Θ}\] verus T plot, the plot Fe to FeO goes upward and the plot for C to CO goes downwards.
At temperature above point A, the C to CO line comes below Fe to FeO and \[\ce{ΔG^Θ_{(C, CO)} < {ΔG^Θ_{(Fe, FeO)}}}\]
So on this range, \[\ce{C}\] will reduce \[\ce{FeO}\] to \[\ce{Fe}\] and itself be oxidized to \[\ce{CO}\].
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