Which of the following compounds is formed when sodium burns in excess supply of air? — s Block Elements Chemistry Question

💡 Solution & Explanation

Step 1: When sodium metal is heated in a free or excess supply of dry air or oxygen, it burns vigorously with a yellow flame. Step 2: Due to the moderate size of the Na+ cation, it forms a stable peroxide lattice containing the peroxide ion (O2^2-). Step 3: The reaction is: 2Na + O2 -> Na2O2 (sodium peroxide). Thus, the correct option is (c).