Q.

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

A. Carbondioxide
B. Nitrogen
C. Oxygen
D. Sulphurdioxide
Answer» A. Carbondioxide
Explanation: Lime water is calcium hydroxide (Ca(OH)2). When carbon dioxide is passed into it, it turns milky because of the formation of calcium carbonate: Ca(OH)2 + CO2 = CaCO3 +H2O
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