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An acid reacts with a metal to produce a gas that gives a pop sound near a burning splint. Which gas is it?

Answer and explanation

Correct answer: Hydrogen

The governing reaction is: acid + reactive metal → salt + hydrogen gas. For example, zinc reacts with dilute hydrochloric acid to form zinc chloride and hydrogen. Hydrogen is combustible and produces the characteristic ‘pop’ when tested with a burning splint, so option A is correct. Carbon dioxide generally extinguishes a flame, while chlorine and ammonia do not give this standard pop test.

Related tags

Hydrogen TestMetal-Acid ReactionGas IdentificationAcidsBasesAnd SaltsAcids Bases And SaltsChemical Substances – Nature And BehaviourChemical Substances Nature And BehaviourScience

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