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An unknown sample reacts with acid to give a gas that turns lime water milky. Which class could the sample belong to?

Answer and explanation

Correct answer: Carbonate or hydrogen carbonate

Limewater turns milky when carbon dioxide passes through it because insoluble calcium carbonate forms: CO₂ + Ca(OH)₂ → CaCO₃ + H₂O. Acids react with carbonates and hydrogen carbonates to release carbon dioxide, for example, CaCO₃ + 2HCl → CaCl₂ + H₂O + CO₂. Therefore option A is correct. The other classes are too restrictive or do not generally produce this gas with acid.

Related tags

CarbonatesLimewater TestCarbon DioxideAcidsBasesAnd SaltsAcids Bases And SaltsChemical Substances – Nature And BehaviourChemical Substances Nature And BehaviourScience

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