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Question
Chemistry
When CO2 is passed through solution of sodium aluminate, precipitate of which compound is formed?
Q. When
C
O
2
is passed through solution of sodium aluminate, precipitate of which compound is formed?
3343
234
AIIMS
AIIMS 2014
The p-Block Elements
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A
A
l
(
O
H
)
3
57%
B
A
l
2
O
3
18%
C
N
a
2
C
O
3
21%
D
No ppt
4%
Solution:
In Hall's process, for purifying the bauxite ore, the solution containing sodium meta aluminate is warmed to
50
−
6
0
∘
C
and carbon dioxide is circulated through it,
A
l
(
O
H
)
3
separates out as precipitate.
2
N
a
A
l
O
2
+
C
O
2
+
3
H
2
O
⟶
2
A
l
(
O
H
)
3
+
N
a
2
C
O
3