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Which among the following statement(s) is(are) true for the extraction of aluminium from bauxite?
Hydrated $$Al_2O_3$$ precipitates, when $$CO_2$$ is bubbled through a solution of sodium aluminate.
Addition of $$Na_3AlF_6$$ lowers the melting point of alumina.
$$CO_2$$ is evolved at the anode during electrolysis.
The cathode is a steel vessel with a lining of carbon.
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