Which gas is released when an acid reacts with a metal carbonate?

Options

  • A. Oxygen
  • B. Hydrogen
  • C. Carbon dioxide
  • D. More than one of the above
  • E. None of the above

Correct Answer (Detailed Explanation is Below)

C. Carbon dioxide

Detailed Explanation

Carbon dioxide (CO2) is released when an acid reacts with a metal carbonate. For example, hydrochloric acid reacts with calcium carbonate to form calcium chloride, water and carbon dioxide. This reaction is commonly used to demonstrate gas evolution in chemistry. Important reaction terms include acid, carbonate, salt, neutralisation and gas evolution.