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In which reaction is a gas most likely to form that turns lime water milky?

Answer and explanation

Correct answer: Sodium carbonate and dilute acid

The governing test is that carbon dioxide turns limewater milky because it reacts with calcium hydroxide to form insoluble calcium carbonate. An acid reacting with a carbonate releases carbon dioxide: sodium carbonate + dilute acid → salt + water + CO₂. Zinc with dilute acid mainly releases hydrogen, while sodium hydroxide with water and common salt with water do not produce carbon dioxide. Therefore, option B is correct.

Related tags

CarbonateAcid-ReactionCarbon-DioxideLime-WaterClass10AcidsBasesAnd SaltsAcids Bases And SaltsChemical Substances – Nature And Behaviour

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