Question

(i) Gases exert pressure on the walls of the container

Answer 1

The molecules are continually colliding with each other and with the walls of the container. When a molecule collides with the wall, they exert small force on the wall The pressure exerted by the gas is due to the sum of all these collision forces.The more particles that hit the walls, the higher the pressure.

the reason behind this base phenomena is the high kinetic energy possesed by gases

Answer 2

the particles are constantly moving in all directions with different speeds as a result the particles of gas colloide with each other and also against wall of container. So the result of these collisions the gas exerts some force although wall of container . This force per unit area is called pressure of the gas