Question

give reasons - a gas exerts pressure on the walls of a container

Answer 1

Because gas has more inter molecular space and has lower inter molecular force of attraction so gases expend easily toward all direction and exert pressure on the walls of a container.

Answer 2

$\mathfrak{\huge{\red{\underline{\underline{Answer}}}}}$

The pressure exerted by a gas is due to the random motion of particles in the gas. Gases have weak intermolecular forces and the particles in continuous random motion and these particles collide with the walls of the container. These collisions with the walls of the container exerts pressure on the gas

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