Which one of the following is not a correct postulate of kinetic theory of gases ?

The postulates of Kinetic Theory of Gases are given below- (1) Gases consist of collection of small atoms and molecules with very small mass and volume is negligible compared to the volume of the container. (2) There is no kind of existence of force of attraction or repulsion in between the gaseous particles. (3) The gaseous particles are in constant state of motion randomly in all directions and in straight line. (4) The gaseous molecules occupy the total volume of the container due to its constant motion. (5) Due to its motion, average kinetic energy is directly proportional to the temperatu