Question

a gas exerts pressure on the wall of the container. give reason.

Answer 1

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It happens because the molecules of the gas collide with the wall of the container thus a gas exerts pressure on the wall

Answer 2

As gas has no fixed volume and shape so its particles are continuosly in motion and keeps on colliding with the walls of the container. When a particle hit wall it exert small pressure on the wall of container. When the collision force exerted by all the particles of gas then the pressure increases. This is how gas exerts pressure on walls of container.