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(C) In the Bayer's process for the extraction of aluminum from bauxite,the ore is treated with a concentrated solution of $NaOH$ at $473-523 \ K$ and

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$Fe, Ti$

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(C) In the Bayer's process for the extraction of aluminum from bauxite,the ore is treated with a concentrated solution of $NaOH$ at $473-523 \ K$ and $35-36 \ bar$ pressure. $Al_2O_3 \cdot 2H_2O + 2NaOH + H_2O \rightarrow 2Na[Al(OH)_4]$. During this process,impurities like $Fe_2O_3$ (ferric oxide),$TiO_2$ (titanium dioxide),and $SiO_2$ (silica) remain insoluble and are removed as 'red mud'. Among the given options,$Fe$ and $Ti$ compounds ($Fe_2O_3$ and $TiO_2$) are the primary insoluble impurities that precipitate out.

During the extraction of sodium aluminate from bauxite,the compounds of ....... are insoluble and precipitate out.

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