Carbonates and bicarbonates react with acids to produce carbon dioxide gas (CO₂), water, and a salt. CO₂ gas, when bubbled through limewater (calcium hydroxide solution), reacts to form insoluble calcium carbonate, which appears as a milky precipitate.
Two reactants in a flask at room temperature are producing bubbles of a gas that turn limewater milky. The reactants could be
Asked in UPSC CDS 2 2018 · Topic: Acid, Base and Salt (Reactions of Acids and Bases (Neutralization, reaction with metals, metal carbonates/bicarbonates))
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Answer: B. magnesium carbonate and hydrochloric acid
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