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Dilute sulphuric acid is added to zinc pieces in a test tube. The evolved gas burns with a pop sound near a burning splint. What is the correct chemical reason?

Answer and explanation

Correct answer: Metal reacts with acid to produce hydrogen gas

Zinc is above hydrogen in the reactivity series, so it displaces hydrogen from dilute sulphuric acid: Zn + H₂SO₄ → ZnSO₄ + H₂. The gas evolved is hydrogen, and hydrogen burns rapidly with oxygen in air, producing the characteristic pop sound. Oxygen, nitrogen and chlorine are not products of this metal–acid reaction, so option A is correct.

Related tags

Metal-Acid-ReactionHydrogenSulphuric-AcidAcidsBasesAnd SaltsAcids Bases And SaltsChemical Substances – Nature And BehaviourChemical Substances Nature And BehaviourScience

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