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Carbonates and bicarbonates, thermal stability
JEE Main level
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Difficulty 2 of 3
sb137
Water containing dissolved
Ca
(
HCO
X
3
)
X
2
is boiled for some time. The precipitate formed and the gas evolved are:
A
Ca
(
OH
)
X
2
and
CO
X
2
B
CaO
and
CO
X
2
C
CaCO
X
3
and
CO
X
2
D
CaCO
X
3
and
H
X
2
Answer: C
Temporary hardness is removed on boiling:
Ca
(
HCO
X
3
)
X
2
CaCO
X
3
+
CO
X
2
+
H
X
2
O
. The insoluble carbonate is the precipitate and carbon dioxide is evolved.
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