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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 non-metal

B

the heat of formation of `CO_(2)` is more then that of `Al_(2)O_(3)`

C

pure carbon is not easily available

D

the heat of formation of `Al_(2)O_(3)` is too high

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The correct Answer is:
d
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