Question

State any four assumptions of kinetic theory of gases.

Answer 1

We have seen the properties of ideal gas. Just like ideal gas properties, in order to apply the kinetic theory of gases for a particular gas or mixture of gases we will assume something regarding those first. Then we will proceed. Most of the kinetic theory assumptions are the same as ideal gas assumptions.

Complete answer:
From the title itself it is clearly evident that kinetic theory is related to motion. So by using kinetic theory of gases, we derive some important properties of gases. The main assumptions are
(a) A gas contains of infinitely large amount of identical molecules
(b) All the molecules of gases are in constant motion. They are not stationary.
(c) A particular gas molecule can be treated as an ideal one.
(d) Main thing is intermolecular forces among the molecules can be ignored.
If we see above assumptions, even in ideal gas assumptions we assume that gas behaves as ideal gas at very high temperature and low pressure, because then only we can neglect the intermolecular forces.
From the third point it is very clear that this kinetic theory is only applicable for ideal gases.
As long as temperature is constant the speed of all the molecules will be constant and same. Pressure is applied on gas due to collisions between walls and molecules.

Note:
Speed of all the gas molecules is assumed to be the same and collisions between them or between walls and them are assumed to be elastic. So speed will never change as momentum and kinetic energy are conserved and the mass of all the molecules is the same. The path of molecules is assumed to be straight line only.