Question

5. Give reason for the following:

(a) Metals are used to make strings of musical instruments.

(b) Copper bottomed utensils are used for cooking.

(c) Sodium is kept in kerosene while phosphorous is kept in water.​

Answer 1

(a) metals are malleable and the produces sound

(b) because of copper's excellent heat conductivity.

(c) sodium is highly reactive metal and it easily and quickly reacts with water and atmospheric air. If we keep it open in air, it will have a tendency to catch fire very fast. Therefore, the metal is kept in the kerosene.

Answer 2

1. metals can be ductiled very easily hence it is used for making the string instrument and also for for a perfect musical note the elasticity of it should be limited hence metal is used.
2. copper is a metal which is a good conducted of heat and it also has medicinal Uses as well so it maintains good health as well
3. sodium is very active metal the reaction of the metal with oxygen or any gas can be vigorous hence it is kept in kerosene. and phosphorus is kept in water because it is not a stable element.