Which of the following process is used for extraction of alluminium?

Baeyer's Process

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Dow's process

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Serpeck's process

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Hall- Heroult process

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Solution

The correct option is D Hall- Heroult process
In Bayer's process,
$A l_{2} O_{3} + N a O H (b a s e) \to (N a A l O_{2})$
$N a A l O_{2} + H_{2} O + C O_{2} (a c i d i c) \to A l (O H)_{3} ↓$

Dow's process is used in extraction of $M g$ .

In Serpeck's proccess,
$A l_{2} O_{3} + 3 C + N_{2} \to 2 A l N (s) + 3 C O ↑ S i O_{2} + 2 C \to S i ↑ + 2 C O ↑ A l N + N a O H + 3 H_{2} O \to N a [A l (O H)_{4}] + N H_{3} N a [A l (O H)_{4}] H_{2} O ⇋ A l (O H)_{3} ↓ + N a O H$

In Hall-Heroult process,
$2 A l_{2} O_{3} + 3 C \to 4 A l + 3 C O_{2}$

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