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Question

Why does CO2 turn lime water milky?


A

Calcium carbonate is formed

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B

Calcium hydroxide is formed

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C

Hydrogen gas is released

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D

Milk protein is formed

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Solution

The correct option is A

Calcium carbonate is formed


Lime water is calcium hydroxide.
CO2, being an acidic gas, reacts with the calcium hydroxide which is a base to form a salt, calcium carbonate.
Calcium carbonate is white and insoluble in water, hence it makes the water appear milky.


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