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A gas evolves when carbonate is added to an acidic solution. If the gas turns lime water milky, which gas is it?

Answer and explanation

Correct answer: Carbon dioxide

A carbonate reacts with an acid to form a salt, water, and carbon dioxide: carbonate + acid → salt + H₂O + CO₂. Passing carbon dioxide through limewater produces insoluble calcium carbonate, which makes the liquid milky. Therefore option B is correct. Hydrogen, oxygen, and nitrogen do not give this characteristic limewater test under these conditions.

Related tags

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

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