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A gas turns lime water milky and in excess removes the milkiness. This gas is most likely formed from what?

Answer and explanation

Correct answer: Reaction of acid and carbonate

The gas is carbon dioxide. First, carbon dioxide reacts with lime water, calcium hydroxide, to form insoluble calcium carbonate, which produces the milky appearance. When carbon dioxide is passed in excess, the precipitate changes into soluble calcium hydrogen carbonate. Acids reacting with carbonates release carbon dioxide, so option A is correct; the other reactions do not normally produce this gas.

Related tags

Carbonate ReactionLime WaterCarbon DioxideAcidsBasesAnd SaltsAcids Bases And SaltsChemical Substances – Nature And BehaviourChemical Substances Nature And BehaviourScience

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