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:
- $Al+NaOH(a q) \longrightarrow NaAlO _2+H _2$
$$ \begin{gathered} NaAlO _2+CO _2(a q) \longrightarrow Na _2 CO _3+Al(OH) _3 \downarrow \ Al(OH) _3 \stackrel{\Delta}{\longrightarrow} Al _2 O _3+H _2 O \end{gathered} $$
