Metals are extracted from their ores by a wide variety of techniques. The most common ores are oxides. Most metals are obtained by direct treatment of theirs ores with chemical agents, but the extraction of certain others require electrolysis. An example of the former type of process is the extraction of iron from its oxide, described by the following equation : Fe_(2) O_(3) + 3C rarr 2Fe + 3CO The relative ease of extraction of a metal from its oxide can be estimated using the Ellingham diagram, as shown in the figure. The diagram plots the free energies of formation of various oxides per mole of consumed oxygen as a function of absolute temperature. FIITJEE_CHE_MB_04_C02_E07_009_Q01.png" width="80%"> When ferric oxide is reduced to obtain iron metal, CO_(2) or CO can be produced. The production of CO_(2)

Metals are extracted from their ores by a wide variety of techniques.

1.	Metals are extracted from their ores by a wide variety of techniques. The most common ores are oxides. Most metals are obtained by direct treatment of theirs ores with chemical agents, but the extraction of certain others require electrolysis. An example of the former type of process is the extraction of iron from its oxide, described by the following equation : Fe_(2) O_(3) + 3C rarr 2Fe + 3CO The relative ease of extraction of a metal from its oxide can be estimated using the Ellingham diagram, as shown in the figure. The diagram plots the free energies of formation of various oxides per mole of consumed oxygen as a function of absolute temperature. FIITJEE_CHE_MB_04_C02_E07_009_Q01.png" width="80%"> When ferric oxide is reduced to obtain iron metal, CO_(2) or CO can be produced. The production of CO_(2)
Answer» is directily proportional to the temperature is inversely proportional to the temperature is independent of the temperature requires COOLING of the CO Answer :C