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Question

Why is Al obtained only by electrolytic reduction of alumina (pure)?


A
Aluminium metal has a strong affinity for oxygen and electrolytic reduction is a more powerful reduction method
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B
Al2O3 is a very stable oxide
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C
Ordinary chemically reducing agents are not sufficient to reduce Al2O3
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D
None of these
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Solution

The correct options are
A Aluminium metal has a strong affinity for oxygen and electrolytic reduction is a more powerful reduction method
B Al2O3 is a very stable oxide
C Ordinary chemically reducing agents are not sufficient to reduce Al2O3
Al2O3 is a very stable oxide because aluminium metal has strong affinity for oxygen. Thus ordinary chemical reducing agents are not sufficient to reduce Al2O3. Electrolytic reduction is required.

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