Sodium metal is always kept under oil because it
- Readily reacts with water
- Is reduced by atmospheric nitrogen
-
Reacts vigorously on exposure to air
- Reacts with oxygen and carbon (IV) oxide
The correct answer is: C
Explanation
Sodium metal is always kept under oil, typically kerosene, because it is a highly reactive metal that readily reacts with oxygen and moisture in the air, potentially causing a fire if exposed directly; by submerging it in oil, this contact is prevented and the metal remains stable. Also, sodium metal reacts vigorously with oxygen and carbon dioxide in air as it is a highly reactive metal that can catch fire and burn when exposed to air. It reacts vigorously with air, especially in the presence of moisture. Sodium is a highly reactive metal that can ignite spontaneously in air.
Option D would have been also correct but option C is more detailed and all encompassing because in air, we have O\(_2\). CO\(_2\). as well as water vapour. Therefore, option C is the correct answer