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Which test is correct to confirm the gas released in the reaction of an acid with an active metal?

Answer and explanation

Correct answer: A pop sound near a burning splint

An active metal reacting with a dilute acid generally produces hydrogen gas and a salt: metal + acid → salt + H₂. Hydrogen is combustible and, when a small sample is brought carefully near a burning splint, it burns with a characteristic ‘pop’ sound. Limewater turning milky identifies carbon dioxide, while turmeric and phenolphthalein are indicators rather than confirmation tests for hydrogen. Hence option B is correct.

Related tags

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

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