The conversion of aluminium hydroxide to pure alumina is carried out by:

addition of

A l (O H)_{3}

crystals

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thermal decomposition

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precipitation

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none of these

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Solution

The correct option is B thermal decomposition
By thermal decomposition as:
$2 N a A l O_{2} + C O_{2} + 3 H_{2} O \to 2 A l (O H)_{3} ↓ + N a_{2} C O_{3}$
$2 A l (O H)_{3} 1000^{o} C - --- \to A l_{2} O_{3} + 3 H_{2} O$

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Similar questions

Electrolytic reduction of alumina to aluminium by Hall-Heroult process is carried out:

A l C l_{3}

H_{2} S O_{4}

A l C l_{3} + 3 N a O H \to A l (O H)_{3} + 3 N a C l

2 A l (O H)_{3} + 3 H_{2} S O_{4} \to A l_{2} (S O_{4})_{3} + 6 H_{2} O

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