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The metal oxide that cannot be reduced to metal by carbon

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${Al}_{2} O_{3}$

${Fe}_{2} O_{3}$

$ZnO$

$PbO$

answer is D.

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Detailed Solution

Oxides of less reactive metals (like PbO,ZnO,Fe₂O₃) can be reduced by carbon.
While oxides of reactive metals (like Al₂O₃) can be reduced only by the electrolytic method.

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