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Question

When CO2 is passed through lime water, it turns milky. The milkiness is due to:

A
CaCO3
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B
Ca(OH)2
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C
H2O
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D
CO2
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Solution

The correct option is B CaCO3
CO2 dissolves in water to form carbonic acid.
CO2(g)+H2O(l)H2CO3(aq)
Lime water, which is calcium hydroxide, neutralizes the carbonic acid. The product is calcium carbonate, an insoluble, white salt. Hence the milkiness of the solution.
H2CO3(aq)+Ca(OH)2(aq)CaCO3(s)+2H2O(l)
Overall, this reaction can be represented as:
Ca(OH)2+CO2CaCO3+H2O

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