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When zinc is added to an unknown solution, a gas is released and it gives a pop sound near a burning splint. What could be the nature of the solution?

Answer and explanation

Correct answer: Acidic solution

The governing concept is the reaction of a sufficiently reactive metal with an acid. Zinc can displace hydrogen from many dilute acids, forming a salt and hydrogen gas; for example, Zn + 2HCl → ZnCl₂ + H₂. Hydrogen burns with a characteristic pop when tested near a flame or burning splint. Therefore the unknown solution could be acidic. Neutral water, salt solution, and sugar solution do not normally produce this test with zinc under these conditions, so B is correct.

Related tags

ZincAcid-Metal-ReactionHydrogenPop-SoundAcidsBasesAnd SaltsAcids Bases And SaltsChemical Substances – Nature And BehaviourChemical Substances Nature And Behaviour

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