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Although thermodynamically feasible, Mg is not used as reducing agent for ${Al}_{2} O_{3}$ because

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The process is not economical

The reaction is not environmental friendly

The temperature required can not be obtained

Magnesium is a soft metal

answer is A.

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Detailed Solution

Although Mg can reduce alumina but still it is not recommended because the process is not economical because Mg is not a cheap reducing agent

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