1.

Bauxite, an ore of aluminium is purified by

Answer»

Halls' process 
Serpek's process 
Bayer's process 
All of these 

SOLUTION :Hall.s and Bayer.s processes are used if ALUMINIUM ore contains iron OXIDE as IMPURITY, while Serpek.s process is used when `SiO_2` is present as an impurity.


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