Question

why carbon is not used for reducing aluminum from aluminum oxide​

Answer 1

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Because aluminium has greater affinity for oxygen than for carbon, therefore carbon cannot reduce alumina (Al2O3) to aluminium.

Answer 2

Answer:

Because aluminium has greater affinity for oxygen than for carbon, therefore carbon cannot reduce alumina (Al2O3) to aluminium.

Aluminium has greater reactivity with oxygen than carbon and hence, cannot be reduced by carbon.

Carbon is not used for reducing oxides of sodium or aluminium as they themselves hold a greater affinity for oxygen than carbon.