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Which substance can absorb an acidic gas and form a salt?

Answer and explanation

Correct answer: Calcium hydroxide

Calcium hydroxide, Ca(OH)₂, is a base and can react with an acidic oxide such as carbon dioxide. For example, Ca(OH)₂ + CO₂ → CaCO₃ + H₂O; calcium carbonate is the salt formed, and the limewater may turn milky. Vinegar, hydrochloric acid, and lemon juice are acidic substances, so they do not normally neutralise an acidic gas to produce a salt in this context. Hence option A is correct.

Related tags

Calcium HydroxideAcidic GasSalt FormationAcidsBasesAnd SaltsAcids Bases And SaltsChemical Substances – Nature And BehaviourChemical Substances Nature And BehaviourScience

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