Chemistry 2001 JAMB Past Questions - Question 21: Phosphorus is stored under water to prevent it from

Correct Answer

D

Explanation

Phosphorus is often stored under water to prevent it from reacting with oxygen in the air. Elemental phosphorus exists in several allotropes, with white phosphorus being the most reactive. When exposed to air, white phosphorus can react with oxygen and form phosphorus pentoxide, a compound that can be harmful and is also a potent desiccant.

By storing phosphorus under water, it is effectively isolated from the air, preventing the oxidation reaction. This helps to avoid the formation of phosphorus pentoxide and other oxides. Additionally, white phosphorus can be quite flammable, and storing it underwater reduces the risk of ignition.

It's worth noting that different forms of phosphorus have varying properties and reactivities, and the precautions taken in handling and storing phosphorus depend on its specific allotrope and the intended use.