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
• B. $A{l}_2{O}_3$ is a very stable oxide
• C. Ordinary chemically reducing agents are not sufficient to reduce $A{l}_2{O}_3$
• D. None of these

Answer 1

Answer: (A), (B), (C)

The correct options are
A Aluminium metal has a strong affinity for oxygen and electrolytic reduction is a more powerful reduction method
B $A{l}_2{O}_3$ is a very stable oxide
C Ordinary chemically reducing agents are not sufficient to reduce $A{l}_2{O}_3$

$A{l}_2{O}_3$ is a very stable oxide because aluminium metal has strong affinity for oxygen. Thus ordinary chemical reducing agents are not sufficient to reduce $A{l}_2{O}_3$. Electrolytic reduction is required.