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A sample gives carbon dioxide with acid and its aqueous solution turns red litmus blue. Which substance is most likely?

Answer and explanation

Correct answer: Sodium carbonate

Carbonates react with acids to release carbon dioxide, for example: sodium carbonate plus hydrochloric acid produces sodium chloride, water, and CO₂. The blue colour produced from red litmus also shows that the aqueous solution is basic. Sodium carbonate satisfies both tests. Sodium chloride is nearly neutral, ammonium chloride is acidic, and copper sulphate does not give carbon dioxide with an acid. Therefore A is correct.

Related tags

Carbonate TestSodium CarbonateCarbon DioxideAcidsBasesAnd SaltsAcids Bases And SaltsChemical Substances – Nature And BehaviourChemical Substances Nature And BehaviourScience

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