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Which test identifies the gas released when an acid reacts with an active metal?

Answer and explanation

Correct answer: A pop sound near a burning splint

An active metal reacts with an acid to form a salt and hydrogen gas: metal + acid → salt + H₂. When a burning splint is brought near hydrogen, the gas burns rapidly and produces the characteristic ‘pop’ sound. Limewater turning milky identifies carbon dioxide, while the other tests do not identify hydrogen. Therefore option A is correct.

Related tags

Hydrogen TestAcid-Metal ReactionGas IdentificationAcidsBasesAnd SaltsAcids Bases And SaltsChemical Substances – Nature And BehaviourChemical Substances Nature And BehaviourScience

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