Lime water turns milky when the exhaled air is expelled in the test tube because of the presence of

Carbon dioxide

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Oxygen

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Nitrogen

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None of the above

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Solution

The correct option is A Carbon dioxide
When carbon dioxide is passed through lime water for a short time,it turns lime water milky due to formation of a white precipitate of calcium carbonate.
Exhaled air contains less oxygen and more carbon dioxide.
The carbon dioxide present in exhaled air turns lime water milky.
So the correct answer is 'Carbon dioxide'.

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