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Class 10ScienceChemical Substances – Nature and BehaviourAcids, Bases, and SaltsHard
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Carbon dioxide first makes lime water milky and then removes the milkiness in excess. What is the second soluble substance?

Answer and explanation

Correct answer: Calcium hydrogen carbonate

Initially, carbon dioxide reacts with calcium hydroxide in limewater to form insoluble calcium carbonate, which causes milkiness: Ca(OH)2 + CO2 → CaCO3 + H2O. When excess CO2 is passed, the calcium carbonate reacts further and forms soluble calcium hydrogen carbonate: CaCO3 + CO2 + H2O → Ca(HCO3)2. Thus option A is correct; calcium carbonate is the first, insoluble product.

Related tags

LimewaterExcess Carbon DioxideCalcium Hydrogen CarbonateAcidsBasesAnd SaltsAcids Bases And SaltsChemical Substances – Nature And BehaviourChemical Substances Nature And BehaviourScience
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