Sodium metal is storwd under oil.Explain the observation?

Sodium metal is stored under oil to prevent it from reacting with moisture and oxygen in the air. Sodium is a highly reactive metal and can react violently with water, producing hydrogen gas and heat. Storing sodium under oil creates a barrier between the metal and the air, preventing it from coming into contact with moisture and oxygen. This helps to keep the sodium stable and prevent any dangerous reactions from occurring. Additionally, the oil helps to prevent the formation of a layer of sodium oxide on the surface of the metal, which can also react with moisture in the air.