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A solution turns red litmus blue. When ammonium chloride is added to it and heated, a pungent-smelling gas is evolved. Which gas is it?

Answer and explanation

Correct answer: Ammonia

Turning red litmus blue shows that the solution contains a base, such as sodium hydroxide. On heating with ammonium chloride, the base releases ammonia: NaOH + NH₄Cl → NH₃ + H₂O + NaCl. Ammonia has a characteristic pungent smell and turns moist red litmus blue. Hydrogen, carbon dioxide and sulphur dioxide do not fit these observations, so A is correct.

Related tags

BasesAmmonium-SaltAmmoniaAcidsAnd SaltsAcids Bases And SaltsChemical Substances – Nature And BehaviourChemical Substances Nature And BehaviourScience

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