The reaction of an acid and a metal gives : 

Key Points

• The reaction between an acid and a metal produces hydrogen gas and salt.
• This type of reaction is a common example of a single displacement reaction where the metal displaces hydrogen from the acid.
• The general equation for this reaction is:
  Metal + Acid → Salt + Hydrogen gas.
• For example, when zinc reacts with hydrochloric acid, zinc chloride and hydrogen gas are produced:
  Zn + 2HCl → ZnCl₂ + H₂.

Additional Information

• Not all metals react with acids to produce hydrogen gas. For example, copper does not react with dilute hydrochloric acid.
• The reactivity of a metal with an acid depends on its position in the reactivity series. Metals above hydrogen in the reactivity series will typically displace hydrogen from acids.
• Safety note: Hydrogen gas is flammable, and care should be taken to avoid ignition sources when performing such reactions.