Which among the following statement(s) is false for the extraction of aluminium from bauxite?

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Addition of $N a_{3} A l F_{6}$ lowers the melting point of alumina

The anode is a steel vessel with a lining of carbon.

$C O_{2}$ is evolved at the anode during electrolysis.

Hydrated $A l_{2} O_{3}$ precipitates, when $C O_{2}$ is bubbled through a solution of sodiummeta aluminate.

answer is D.

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Detailed Solution

$(A) 2 N a {[A l {(O H)}_{4}]}_{(a q)} + C O_{2} \to N a_{2} C O_{3} + H_{2} O + 2 A l {(O H)}_{3} (↓)$
(B) Function of ${Na}_{3} {AlF}_{6}$ is to lower the melting point of electrolyte.
(C) During electrolysis of ${Al}_{2} O_{3}$ the reactions at anode are:
$\begin{array}{l} [2 A l^{3 +} (ℓ) + 3 O^{2 -} (ℓ) \overset{A t a n o d e}{\to} O_{2} (g a s) + 2 e^{-}] \\ C (g r a p h i t e) + O_{2} \to C O (↑) + C O_{2} (↑) \end{array}$
(D) The steel vessel with a lining of carbon acts as cathode.