If lime water is kept in the air, it turns milky due to presence of:

Q. If lime water is kept in the air, it turns milky due to presence of:
Answer: Carbon dioxide
Notes: Lime water is calcium hydroxide (Ca(OH)2). When carbon dioxide is passed into it, it turns milky because of the formation of insoluble calcium carbonate:

Ca(OH)2 + CO2 —> CaCO3 + H2O

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