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A sample gives a gas that turns lime water milky. On passing excess gas, the milkiness disappears. Which two calcium compounds form in order?

Answer and explanation

Correct answer: Calcium carbonate then calcium hydrogen carbonate

The governing test is the limewater reaction with carbon dioxide. First, CO2 reacts with calcium hydroxide: Ca(OH)2 + CO2 → CaCO3 + H2O. Insoluble calcium carbonate forms the milky appearance. When excess CO2 is passed, it reacts further: CaCO3 + CO2 + H2O → Ca(HCO3)2. Calcium hydrogen carbonate is soluble, so the milkiness disappears. Thus option A gives the compounds in the correct order.

Related tags

Lime WaterCalcium CarbonateCarbon DioxideCarbon And Its CompoundsChemical Substances – Nature And BehaviourChemical Substances Nature And BehaviourScienceClass 10 Mcq

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