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Carbon cannot be used in the reduction of ${Al}_{2} O_{3}$ because

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it is an expensive proposition

pure carbon is not easily available

the enthalpy of formation of ${Al}_{2} O_{3}$ is too high

the enthalpy of formation of ${CO}_{2}$ is more than that of ${Al}_{2} O_{3}$

answer is D.

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Detailed Solution

Carbon cannot be used in the reduction of ${Al}_{2} O_{3}$ as the enthalpy of formation of ${Al}_{2} O_{3}$ is too high. Aluminium has very high enthalpy.

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