11. Which of the following metals catch fire on reaction with air? A. Magnesium B. Manganese C. Potassium D. Calcium code example

Example: 11. Which of the following metals catch fire on reaction with air? A. Magnesium B. Manganese C. Potassium D. Calcium

Answer. Explanation: Sodium and potassium both are extremely reactive and react with air as well as water vigorously. The reactions are highly exothermic and hence, the hydrogen gas evolved as byproduct catches fire.