When bauxite is treated with sodium hydroxide solution which of the following is produced?

Sodium aluminate

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Aluminium sulphate

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Sodium sulphate

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None of these

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Solution

The correct option is A Sodium aluminate
It is dissolved in sodium hydroxide to form sodium aluminate.

Reactions:
$A l_{2} O_{3} + 3 C + N_{2} \to 3 A l N + 3 C O ↑$

$S i O_{2} + 2 C \to S i ↑ + 2 C O ↑$

$A l N + N a O H \to N a A l O_{2} + N H_{3}$

$N a A l O_{2} + 2 H_{2} O \to A l (O H)_{3} ↓ N a O H$

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