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Standard X
Chemistry
Reaction of Metallic Oxides and Hydroxides with Acids
What visible ...
Question
What visible change is observed in limewater (colourless) when
CO
2
gas is passed through it?
A
The solution turns blue
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B
The solution turns green
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C
The solution turns milky
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D
No colour change
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Solution
The correct option is
C
The solution turns milky
Limewater is the common name for calcium hydroxide. When
CO
2
gas is passed through it, calcium carbonate is formed.
Calcium carbonate is white in colour and insoluble in water. Hence, the solution turns milky. The reaction is:
C
a
(
O
H
)
2
(
a
q
)
+
C
O
2
(
g
)
→
C
a
C
O
3
(
s
)
+
H
2
O
(l)
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What visible change is observed in limewater (colourless) when
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