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Which gas is generally released when an acid reacts with an active metal?

Answer and explanation

Correct answer: Hydrogen

An active metal can displace hydrogen from a dilute acid. The general reaction is: metal + acid → salt + hydrogen gas; for example, Zn + 2HCl → ZnCl₂ + H₂. Therefore hydrogen is released, making option A correct. Oxygen and nitrogen are not produced in this ordinary acid-metal reaction, while carbon dioxide is characteristic of an acid reacting with a carbonate or bicarbonate.

Related tags

Acid-Metal ReactionHydrogenChemical ReactionAcidsBasesAnd SaltsAcids Bases And SaltsChemical Substances – Nature And BehaviourChemical Substances Nature And BehaviourScience

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