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Which insoluble substance first forms when carbon dioxide is passed through lime water?

Answer and explanation

Correct answer: Calcium carbonate

Lime water is a dilute solution of calcium hydroxide, Ca(OH)₂. When carbon dioxide is passed through it, the initial reaction is Ca(OH)₂ + CO₂ → CaCO₃↓ + H₂O. Calcium carbonate is insoluble and forms a white precipitate, making the lime water milky; therefore option B is correct. If excess carbon dioxide continues to pass, the precipitate can dissolve by forming soluble calcium hydrogen carbonate, but that is a later stage, not the first product.

Related tags

Lime WaterCalcium CarbonateCarbon DioxideAcidsBasesAnd SaltsAcids Bases And SaltsChemical Substances – Nature And BehaviourChemical Substances Nature And BehaviourScience

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