Answer:
Bauxite \[(A{{l}_{2}}{{O}_{3}}.x{{H}_{2}}O)\]
is associated with the impurities of ferric oxide and silica. In case. Bauxite
is used directly for the extraction of aluminium, iron and silica present in it
would deposit at the cathode during its electrolyte reduction. As a result, aluminium
obtained from cathode gets contaminated with iron and silica. This makes the
metal brittle. It is readily attacked by air and water.
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