Which of the following is produced when acid reacts with metals?

Salt and hydrogen gas are produced when an acid reacts with a metal. This chemical reaction follows the standard pattern: Metal + Dilute Acid → Salt + Hydrogen gas. The metal displaces hydrogen from the acid, provided the metal is more reactive than hydrogen in the reactivity series. Generally, metals do not produce hydrogen gas when reacting with nitric acid because it is a strong oxidizing agent that oxidizes the hydrogen into water instead.