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Write chemical reactions taking place in the extracion of Aluminium from Bauxite ore .

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Chemical reactions related to Baeyer.s process for the conversion from bauxite to alumina:
1. `Al_(2)O_(3)(s)+2NaOH to 2NaAlO_(2)+H_(2)O`
2. `Na_(2)AlO_(2)+2H_(2)O to Al(OH)_(3)+NaOH`
3. `2Al(OH)_(3) underset("Alumina")overset("Heat")to Al_(2)O_(3)+3H_(2)O`
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