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A gas is evolved when magnesium ribbon is added to dilute sulphuric acid. Which test is most suitable to identify this gas?

Answer and explanation

Correct answer: A burning splint gives a pop sound

The governing concept is the reaction of a metal with a dilute acid. Magnesium reacts with dilute sulphuric acid to form magnesium sulphate and hydrogen: Mg + H₂SO₄ → MgSO₄ + H₂. Hydrogen is identified by bringing a burning splint near the gas; it burns rapidly with a characteristic pop sound. Option A is a test for a basic gas, B is not specific, and D indicates carbon dioxide, so option C is correct.

Related tags

Metal-Acid ReactionHydrogen IdentificationGas TestsAcidsBasesAnd SaltsAcids Bases And SaltsChemical Substances – Nature And BehaviourChemical Substances Nature And BehaviourScience

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