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When zinc metal reacts with dilute sulphuric acid, which test is most suitable to identify the evolved gas?

Answer and explanation

Correct answer: Pop sound near a burning splint

Zinc reacts with dilute sulphuric acid according to Zn + H₂SO₄ → ZnSO₄ + H₂. The evolved gas is hydrogen. When a burning splint is brought near hydrogen, it burns rapidly with a characteristic ‘pop’ sound, so option A is the suitable identification test. Limewater turning milky identifies carbon dioxide, while litmus colour changes test acidity or basicity rather than confirming hydrogen.

Related tags

Acids Bases SaltsHydrogen GasMetal Acid ReactionAcidsBasesAnd SaltsAcids Bases And SaltsChemical Substances – Nature And BehaviourChemical Substances Nature And BehaviourScience

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