SATHEE: Extraction of Metals - Result Question 92

Extraction of Metals - Result Question 92

####95. State the conditions under which the preparation of alumina from aluminium is carried out. Give the necessary equations which need not be balanced.

$(1983, 2 M)$

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Solution:

$A l + N a O H (a q) ⟶ N a A l O_{2} + H_{2}$

$\begin{matrix} N a A l O_{2} + C O_{2} (a q) ⟶ N a_{2} C O_{3} + A l (O H)_{3} ↓ A l (O H)_{3} \overset{Δ}{⟶} A l_{2} O_{3} + H_{2} O \end{matrix}$

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