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Extraction of Aluminium

In Bayer's pr...

Question

In Bayer's process, what is used to convert impure bauxite to pure alumina?

NaOH

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NaCl

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NaF

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Carbon

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Solution

The correct option is A
NaOH

In Bayer's process, concentrated NaOH is used to convert impure bauxite $A l_{2} O_{3} . 2 H_{2} O$ to pure alumina $A l_{2} O_{3}$ . Concentrated NaOH will remove the water from hydrated Bauxite. This is the first step in Bayer's process.

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Similar questions

N a O H

{A l}_{2} O_{3} (s) + 2 O H^{-} (a q) \to 2 A l O_{2}^{-} (a q) + H_{2} O (l)

{F e}_{2} O_{3}

S i O_{2}

A l {(O H)}_{4}^{-}

2 A l {(O H)}_{4}^{-} ⟶ {A l}_{2} O_{3} \cdot 3 H_{2} O (s) + 2 O H_{(a q)}^{-}

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