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Which of the following metal oxides cannot be converted into the metal by reduction with carbon?

1. Fe2O3
2. Al2O3
3. PbO
4. ZnO

Correct answer: Al2O3

Solution

Aluminium is more reactive than carbon, so Al2O3 cannot be reduced by C; it is extracted by electrolysis (Hall-Heroult). Fe2O3, PbO and ZnO are all reduced by carbon.

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