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Overview of General Metallurgical Processes

16. Why Al me...

Question

16. Why Al metal cannot be obtained by the reduction of Al2O3 with Coke.

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Solution

Al metal cannot be obtained by the reduction of Al₂O₃ with Coke (C) because Al has more affinity for oxygen than carbon. So, carbon cannot remove oxygen from Al₂O₃ and thus cannot convert Al₂O₃ into Al.

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Q. Why cannot aluminium metal be obtained by the reduction of aluminium oxide with coke?

Q. Assertion :Al obtained only by electrolytic reduction of Alumina (pure) Reason: Aluminium metal has a strong affinity for oxygen and the oxide of Al is

A l_{2} O_{3}

, which is a very stable oxide. Hence ordinary chemically reducing agents are not sufficient to reduce

A l_{2} O_{3}

Explain why can alkali and alkaline earth metals not be obtained by chemical reduction methods?

Q. Pb can be obtained by reduction of roasted ore with coke.

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Q. In case of Hall's process applied on reduction of

A l_{2} O_{3}

to Al can be done by using:

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