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Question

Why does limewater turn milky when carbon dioxide gas is passed through it?

A
Due to the formation of calcium carbonate.
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B
Due to the formation of calcium hydroxide.
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C
Because hydrogen gas is released.
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D
Because calcium hydroxide reacts with hydrogen gas.
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Solution

The correct option is A Due to the formation of calcium carbonate.
Limewater is calcium hydroxide solution (Ca(OH)2) and it is a base. Carbon dioxide (CO2) being a non-metallic oxide (acidic in nature), reacts with the calcium hydroxide to form a calcium carbonate (CaCO3). The reaction involved is given below:

Ca(OH)2(aq)+CO2(g)CaCO3(s)+H2O(l)

Calcium carbonate obtained is white and insoluble in water, hence it makes limewater appear milky.

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