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  4. When CO2 is passed through solution of sodium aluminate, precipitate of which compound is formed?

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Q. When $CO_2$ is passed through solution of sodium aluminate, precipitate of which compound is formed?

AIIMSAIIMS 2014The p-Block Elements

Solution:

In Hall's process, for purifying the bauxite ore, the solution containing sodium meta aluminate is warmed to $50-60^{\circ} C$ and carbon dioxide is circulated through it, $Al ( OH )_3$ separates out as precipitate.
$2 NaAlO _2+ CO _2+3 H _2 O \longrightarrow 2 Al ( OH )_3+ Na _2 CO _3$