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Which gas is formed when an acid reacts with an active metal?

Answer and explanation

Correct answer: Hydrogen

Many active metals displace hydrogen from dilute acids. The general reaction is: metal + acid → salt + hydrogen gas. For example, zinc reacts with hydrochloric acid as Zn + 2HCl → ZnCl₂ + H₂. Thus hydrogen is the gas formed, so option B is correct. Carbon dioxide is associated with acid–carbonate reactions, whereas oxygen and nitrogen are not released in this standard reaction.

Related tags

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

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