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A white solid gives a gas with acid that turns lime water milky. The solid may belong to which group?

Answer and explanation

Correct answer: Carbonate or hydrogen carbonate

The gas that turns limewater milky is carbon dioxide. Acids react with carbonates and hydrogen carbonates to release carbon dioxide: carbonate or hydrogen carbonate plus acid produces a salt, water, and CO2. The CO2 then reacts with limewater to form insoluble calcium carbonate, causing milkiness. Therefore option A is correct; ordinary chlorides, sulphates, and nitrates do not give this characteristic gas merely with acid.

Related tags

Carbonate TestCarbon DioxideLimewaterAcidsBasesAnd SaltsAcids Bases And SaltsChemical Substances – Nature And BehaviourChemical Substances Nature And BehaviourScience

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