Question

Amphoteric nature of aluminium is employed in which of the following process for extraction of aluminium?

• A. Baeyer's process
• B. Hall's process
• C. Serpeck's process
• D. Dow's process

Answer 1

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

The correct options are
A Baeyer's process
B Hall's process
C Serpeck's process

The purification process of aluminium is based on the amphoteric nature of aluminium oxides. Since aluminium is found in compounds with other elements it needs to be reduced. The Bayer process is essentially referring to the refining of bauxite, the most important aluminium ore, to produce alumina. From here, the intermediate alumina must be smelted into metallic aluminium through the Hall-Heroult Process.