Question

(a) Why are metals used for making bells ?

(b) Why is phosphorus kept under water ?

Answer 1

(a).

It is due to the property of sonorous (make the sound when hit with an object) that metals are used to make bells.

(b).
Phosphorus is a highly reactive element. This means that at room-temperature it reacts very quickly with the oxygen in the air, turning into pentoxide and in the process leading to high combustion.
However, phosphorus is also insoluble in water. When kept under water, it is easy to carry and prevents it from directly reacting with Oxygen in the air.