Answer:
The correct answer is option (a).
Step-by-step explanation:
The very first postulate of kinetic gas theory discuss that the gases have a random motion of particles. The motion of the gas particles continues in a straight lines until or unless they get collide with another particles or with the walls of the containers.
Whereas as other postulates were:
- Gas particles are of point masses with no volume.
- No molecular forces are at work.
- Gas pressure is due to collision of particles with walls of container.
- Kinetic energy of the gas particles is measured in Kelvin temperature.
- Lighter particles moves with higher speed than heavier gas particles.