Which gas is evolved when a reactive metal such as zinc reacts with dilute sulfuric acid?

💡 Solution & Explanation

When active metals like zinc or iron react with dilute mineral acids such as hydrochloric or sulfuric acid, they undergo displacement reactions, producing a metal salt and releasing flammable hydrogen gas. Oxygen and nitrogen do not evolve in standard acid-metal reactions, and carbon dioxide requires a carbonate or bicarbonate reactant. Hydrogen gas burns with a characteristic pop sound when tested with a lighted splint.