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The gas obtained from an acid-metal reaction gives a pop sound near a burning splint. What is the conclusion of this test?

Answer and explanation

Correct answer: The gas is hydrogen

An active metal reacting with a dilute acid commonly produces a salt and hydrogen gas, for example Zn + 2HCl → ZnCl₂ + H₂. Hydrogen is combustible and, when brought near a burning splint, burns rapidly with the characteristic ‘pop’ sound. Therefore option A is the correct conclusion. Carbon dioxide extinguishes a flame, while chlorine and nitrogen do not give this standard pop test for hydrogen.

Related tags

Hydrogen GasAcid Metal ReactionPop TestAcidsBasesAnd SaltsAcids Bases And SaltsChemical Substances – Nature And BehaviourChemical Substances Nature And BehaviourScience

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