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A solution turns red litmus blue and does not release carbon dioxide when acid is added. Which substance is most likely?

Answer and explanation

Correct answer: Sodium hydroxide

Turning red litmus blue establishes that the solution is basic. The additional observation excludes carbonate and hydrogencarbonate salts, because both release carbon dioxide when treated with an acid: carbonate gives CO₂ through acid decomposition, and hydrogencarbonate does so as well. Sodium hydroxide is a strong base and neutralises an acid without producing CO₂. Therefore option C is the best answer; the carbonate choices fail the gas test.

Related tags

Sodium HydroxideBaseCarbonate TestAcidsBasesAnd SaltsAcids Bases And SaltsChemical Substances – Nature And BehaviourChemical Substances Nature And BehaviourScience

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