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Carbon cannot reduce the oxides of sodium, magnesium, calcium and aluminium mainly because

Question
Carbon cannot reduce the oxides of sodium, magnesium, calcium and aluminium mainly because
These metals have more affinity for oxygen than carbon does
Carbon reacts too violently with them
These metal oxides do not actually exist
Carbon itself is too reactive to be used
Answer
These metals have more affinity for oxygen than carbon does
Detailed Explanation
Since these metals have a greater affinity for oxygen than carbon, carbon cannot displace them from their oxides.
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