Which of the statements is a postulate of the kinetic molecular theory of gases? The average kinetic energy of the gas particles is inversely proportional to the square of the absolute temperature of the gas. The average kinetic energy of the gas particles is directly proportional to the absolute temperature of the gas. The average kinetic energy of the gas particles is inversely proportional to the absolute temperature of the gas. The average kinetic energy of the gas particles is directly proportional to the square of the absolute temperature of the gas.

The average kinetic energy of the particles of gas is directly proportional to the absolute temperature of the gas.

Explanation:

Based on the postulates of the kinetic theory of gases all the gases comprise tiny discrete components known as molecules. All these molecules of the gas are in spontaneous arbitrary motion. The observed pressure of the gas is the result of the collision of the molecules of the gas with the walls of the container.  

These collisions between the molecules of the gas are perfectly elastic. Due to this spontaneous random motion, all the molecules of the gas exhibits kinetic energy, which is equivalent to K or absolute temperature. Hence, the correct statement is the second one.