Which among the following statement(s) is(are) true for the extraction of aluminium from bauxite?
Text Solution
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(a,b,c,d)
Sodium meta aluminate is precipitated in the form of A1(OH) 3 or Al 2 O 3 .xH 2 O. i.e hydrated aluminium hydroxide by passing CO 2 gas.
2NaAlO 2 +CO 2 (g) + 3H 2 O( 
) 
+Na 2 CO 3
In electrolytic reduction of A1 2 O 3 by Hall-Haroult process, cryolite (Na 3 AlF 6 ) and fluorspar (CaF 2 ) are added in order to reduce the melting temperature of A1 2 O 3 .
Anode is made up of graphite,
So, C(s) + 2O 2- 
CO 2 (g) + 4e -
Cathode is a steel vessel lined with graphite.
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