If there is force of attraction between the molecules of the gases then the molecules should collide and due to friction their energy should be lost and ultimately there should be no kinetic energy of a particles and all motion of particles should be seized and there should be no concept of gases then why this is not?

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Solution

Gas particles are constantly colliding with each other and the walls of their container. These collisions are elastic; that is, there is no net loss of energy from the collisions. Since their is no loss of energy so motion do not stop and hence gas exist

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