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A sample turns red litmus blue but does not give carbon dioxide when acid is added. What could it be?

Answer and explanation

Correct answer: Sodium hydroxide

Turning red litmus blue shows that the sample is basic. Carbonates and hydrogen carbonates also behave as bases, but when an acid is added they release carbon dioxide, producing visible effervescence. Sodium hydroxide is a strong base and reacts with acid by neutralisation to form salt and water, without producing carbon dioxide. Thus option A fits both observations; options B-D contain carbonate or hydrogen carbonate and would give CO₂.

Related tags

Base TestCarbonate TestSodium HydroxideAcidsBasesAnd SaltsAcids Bases And SaltsChemical Substances – Nature And BehaviourChemical Substances Nature And BehaviourScience

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