According to kinetic molecular theory of gases, which of the following statements are correct?

a) The actual volume of the molecules is negligible in comparison to the empty space between them.

b) Collisions of gas molecules are inelastic.

c) At any particular time, different particles in the gas have the same speed and same kinetic energies.

d) Pressure is exerted by the gas as a result of collision of the particles with the walls of the container.

According to kinetic molecular theory of gases,

a) The actual volume of the molecules is negligible in comparison to the empty space between them. Means particle size is very, very small (point mass).

b) Collisions of gas molecules are perfectly elastic. So, given statement is wrong.

c) At any particular time, different particles in the gas have different speed and different kinetic energies. Therefore, average kinetic energy or average speed is calculated. So, given statement is wrong.

d) Pressure is exerted by the gas as a result of collision of the particles with the walls of the container.

So, statement a and d are correct and b, c are incorrect.