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AIIMS 2014

Exam: AIIMS
Year: 2014
Subject: Chemistry
Chapter: General Principles and Processes of Isolation of Metals

AIIMS 2014 · Chemistry · General Principles and Processes of Isolation of Metals

When CO_2 is passed through solution of sodium aluminate,...

When

\mathrm{CO}_2

is passed through solution of sodium aluminate, precipitate of which compound is formed?

Options

A $\mathrm{Al}(\mathrm{OH})_3$
B $\mathrm{Al}_2 \mathrm{O}_3$
C $\mathrm{Na}_2 \mathrm{CO}_3$
DNo ppt.

Correct answer

A. $\mathrm{Al}(\mathrm{OH})_3$

Step-by-step solution

(a) : In Hall's process, for purifying the bauxite ore, the solution containing sodium meta aluminate is warmed to

50-60^{\circ} \mathrm{C}

and carbon dioxide is circulated through it,

\mathrm{Al}(\mathrm{OH})_3

separates out as precipitate.

2 \mathrm{NaAlO}_2+\mathrm{CO}_2+3 \mathrm{H}_2 \mathrm{O} \longrightarrow 2 \mathrm{Al}(\mathrm{OH})_3+\mathrm{Na}_2 \mathrm{CO}_3

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