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Blue litmus turns red in a solution, and bubbles form when chalk powder is added to it. What is the correct conclusion?

Answer and explanation

Correct answer: The solution is acidic and carbon dioxide formed from chalk

Two observations support the same conclusion. Blue litmus turning red indicates an acidic solution. Chalk is mainly calcium carbonate, CaCO₃. Acids react with carbonates to produce a salt, water, and carbon dioxide: acid + CaCO₃ → salt + H₂O + CO₂. The escaping CO₂ causes bubbles. Hydrogen and oxygen are not the expected gases in this reaction, so option A is correct.

Related tags

ChalkAcidCarbon DioxideAcidsBasesAnd SaltsAcids Bases And SaltsChemical Substances – Nature And BehaviourChemical Substances Nature And BehaviourScience

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