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How is the gas formed in the reaction of an acid and metal carbonate identified?

Answer and explanation

Correct answer: By turning lime water milky

The governing reaction is acid + metal carbonate → salt + water + carbon dioxide. Carbon dioxide is identified by passing it through limewater; it reacts with calcium hydroxide to form insoluble calcium carbonate, making the limewater milky. Hence option A is correct. A pop sound is the test for hydrogen, while litmus colour changes indicate acidic or basic solutions rather than specifically identifying this gas.

Related tags

ScienceClass10Carbon-DioxideLimewater-TestAcidsBasesAnd SaltsAcids Bases And SaltsChemical Substances – Nature And BehaviourChemical Substances Nature And Behaviour

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