In the extraction of aluminium from bauxite, the reagent used to remove silica as an impurity is:

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Bauxite contains SiO₂ (silica) as impurity. In the Bayer's process, powdered bauxite is treated with hot concentrated NaOH solution. Alumina dissolves forming sodium aluminate (NaAlO₂), while silica does not dissolve and is filtered off. Alternatively, silica can be removed by adding lime during refining. The purified alumina is then electrolyzed in cryolite. NaOH selectively dissolves Al₂O₃ due to its amphoteric nature.

In the extraction of aluminium from bauxite, the reagent used to remove silica as an impurity is: MCQ with Answer and Explanation

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