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A gas released in the reaction of a metal with an acid gives a pop sound near a burning splint. Which gas is it?

Answer and explanation

Correct answer: Hydrogen

The relevant gas-identification principle is the pop test. Metals that are above hydrogen in the reactivity series generally react with dilute acids to form a salt and hydrogen gas, for example, Zn + 2HCl → ZnCl₂ + H₂. Hydrogen burns rapidly and produces a characteristic pop near a burning splint. Carbon dioxide extinguishes a flame, oxygen relights it, and chlorine has different tests. Thus option C is correct.

Related tags

HydrogenAcid-Metal-ReactionPop-TestReactivity-SeriesClass10AcidsBasesAnd SaltsAcids Bases And SaltsChemical Substances – Nature And Behaviour

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