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An unknown gas turns lime water milky but does not give a pop sound near a burning splint. Which gas is it?

Answer and explanation

Correct answer: Carbon dioxide

The governing concept is qualitative gas testing. Carbon dioxide reacts with limewater, calcium hydroxide, to form insoluble calcium carbonate, making the liquid milky: CO₂ + Ca(OH)₂ → CaCO₃ + H₂O. Hydrogen produces a characteristic pop when tested with a burning splint, but that result is absent here. Oxygen supports burning rather than turning limewater milky, and chlorine has different bleaching and reactivity tests. Therefore the gas is carbon dioxide, option A.

Related tags

Gas TestsCarbon DioxideLimewaterAcidsBasesAnd SaltsAcids Bases And SaltsChemical Substances – Nature And BehaviourChemical Substances Nature And BehaviourScience

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