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Carbon cannot be used in the reduction o...

Carbon cannot be used in the reduction of `A1_(2)O_(3)` because:

A

it is expensive

B

The enthalpy of formation of `CO_(2)` is more than that of `Al_(2)O_(3)`

C

Pure carbon is not easily available

D

The enthalpy of formation of `Al_(2)O_(3)` is too high

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