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When acid is added to a metal carbonate, the evolved gas turns lime water milky. What is the correct identification and reason?

Answer and explanation

Correct answer: Carbon dioxide because it forms calcium carbonate

Metal carbonates react with acids to produce a salt, water, and carbon dioxide: carbonate + acid → salt + H₂O + CO₂. When the gas is passed through limewater, Ca(OH)₂, it reacts to form insoluble calcium carbonate, CaCO₃, which appears milky: CO₂ + Ca(OH)₂ → CaCO₃ + H₂O. Therefore option A gives both the correct gas and the correct reason.

Related tags

CarbonatesLimewaterCarbon-Dioxide-TestAcidsBasesAnd SaltsAcids Bases And SaltsChemical Substances – Nature And BehaviourChemical Substances Nature And BehaviourScience

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