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Question
Explain with reason:
Carbon can reduce lead oxide but not aluminium oxide.
Answer in Brief
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Solution
Aluminium has a great affinity for oxygen and cannot be reduced by carbon, carbon monoxide, or hydrogen, whereas lead oxide can be easily reduced to metal lead by carbon.
\[\ce{PbO + C -> Pb + CO}\]
\[\ce{PbO + CO -> Pb + CO2}\]
Moreover, aluminium combines with C to form \[\ce{[Al4C3]}\].
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