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Give the chemical reactions involved in the leaching of alumina from bauxite.

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1. $Al_2 O_3 \cdot 2 H_2 O+2 NaOH \rightarrow 2 NaAlO_2+3 H_2 O$

2. $NaAlO_2+2 H_2 O \rightarrow Al(OH)_3 \downarrow+NaOH$

3. $2 Al(OH)_3 \xrightarrow{\Delta} Al_2 O_3+3 H_2 O$

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