1.

In aluminium extraction by the Baeyer's process, alumina is extracted from bauxite by sodium hydroxide at high temperatures and pressures. Al_(2)O_(3(s))+2OH_((aq))^(-) to 2AlO_(2(aq))^(-)+H_(2)O_(l) Solid impurities such as Fe_(2)O_(3) and SiO_(2) are removed and then Al(OH)_(4)^(-) is reprecipitated. In the industrial world

Answer»

carbon dioxide is ADDED to precipitate the alumina
temperature and pressure are dropped and the supersaturated SOLUTION seeded
both (a) and (B) are practised
the WATER is evaporated

Solution :Both (a) and (b) are practised.


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