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In the presence of which gas does lime water turn milky?

Answer and explanation

Correct answer: Carbon dioxide

The governing concept is the limewater test for carbon dioxide. When carbon dioxide is bubbled through limewater, it reacts with calcium hydroxide to form insoluble calcium carbonate, making the solution appear milky: CO₂ + Ca(OH)₂ → CaCO₃ + H₂O. Therefore option A is correct. Hydrogen, nitrogen, and oxygen do not normally produce this milky calcium carbonate precipitate under the test conditions.

Related tags

Acids Bases SaltsLimewater TestCarbon DioxideCalcium CarbonateClass 10 ScienceAcidsBasesAnd SaltsAcids Bases And SaltsChemical Substances – Nature And Behaviour

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