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The metal oxide which cannot be reduced to metal by carbon is

1. Fe₂O₃
2. Al₂O₃
3. PbO
4. ZnO

Correct answer: Al₂O₃

Solution

Al₂O₃ cannot be reduced by carbon because aluminum has a very high affinity for oxygen, making its oxide highly stable. Carbon is not a strong enough reducing agent to reduce Al₂O₃ to aluminum.

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