Chemistry 2004 JAMB Past Questions - Question 39: sodium metal is always kept under oil because it

Correct Answer

C

Explanation

Sodium metal is highly reactive with moisture and oxygen in the air. When exposed to air, sodium can react vigorously, forming sodium hydroxide and releasing hydrogen gas. Additionally, sodium can ignite spontaneously in the presence of moisture. To prevent these reactions and ensure the safety of handling sodium, it is stored under oil or another inert liquid, such as kerosene or mineral oil.

The oil creates a barrier between the sodium and the surrounding air, preventing direct contact with moisture and oxygen. This storage method helps to preserve the metallic properties of sodium and prevents the formation of the corrosive sodium hydroxide and the potentially dangerous release of hydrogen gas. When needed, sodium can be carefully removed from the oil, allowing it to be used in controlled and safe conditions.