The correct statements among the following are

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the principal ore of aluminium is bauxite

the aluminate in solution is neutralised by passing CO2 gas and hydrated Al2O3 is precipitated

impurities present in bauxite are SiO2 and TiO2

sodium silicate remain intact with hydrated alumina

answer is A.

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Detailed Solution

The sodium silicate remains in the solution and hydrated alumina is filtered, dried and heated.

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