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An unknown solid gives a gas with acid. The gas turns lime water milky and the milkiness disappears on passing excess gas. What is likely present in the solid?

Answer and explanation

Correct answer: Carbonate or hydrogen carbonate

The gas is identified as carbon dioxide because it turns limewater milky by forming insoluble calcium carbonate: CO₂ + Ca(OH)₂ → CaCO₃ + H₂O. When excess CO₂ is passed, the precipitate reacts further to form soluble calcium hydrogencarbonate, so the milkiness disappears. Acids release CO₂ from carbonates and hydrogencarbonates. Thus option A is correct.

Related tags

Carbonate TestBicarbonateLime WaterCarbon DioxideAcidsBasesAnd SaltsAcids Bases And SaltsChemical Substances – Nature And BehaviourChemical Substances Nature And Behaviour

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