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A white powder reacts with dilute acid to release a gas. The gas turns lime water milky, and excess gas reduces the milkiness. Which group can the white powder belong to?

Answer and explanation

Correct answer: Carbonate or hydrogen carbonate

The governing test is the carbonate test. Carbon dioxide turns limewater milky by forming insoluble calcium carbonate: Ca(OH)₂ + CO₂ → CaCO₃ + H₂O. When excess CO₂ is passed, soluble calcium hydrogen carbonate forms, so the milkiness disappears. Carbonates and hydrogen carbonates release CO₂ with dilute acids; ordinary chlorides, sulphates and nitrates do not give this characteristic result. Therefore option A is correct.

Related tags

Carbonate TestCarbon DioxideLime WaterAcidsBasesAnd SaltsAcids Bases And SaltsChemical Substances – Nature And BehaviourChemical Substances Nature And BehaviourScience

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