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(B) Bayer's process is a chemical method used for the extraction of alumina $(Al_2O_3)$ from bauxite ore. Bauxite ore often contains impurities such a

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Silica

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(B) Bayer's process is a chemical method used for the extraction of alumina $(Al_2O_3)$ from bauxite ore. Bauxite ore often contains impurities such as silica $(SiO_2)$,iron oxides $(Fe_2O_3)$,and titania $(TiO_2)$. In the Bayer's process,the crushed bauxite is treated with a concentrated solution of sodium hydroxide $(NaOH)$ at high temperature and pressure. This dissolves the alumina to form soluble sodium aluminate,while the major impurity,silica $(SiO_2)$,is also dissolved to form sodium silicate. However,the process is specifically designed to handle bauxite where silica is the primary impurity that needs to be separated from the aluminum hydroxide precipitate.

Bayer's process is used for the purification of Bauxite containing which of the following as a major impurity?

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