According to kinetic theory of gases, I. Collision are always elastic. II. Heavier molecules transfer more momentum to the wall of container. III. Only a small number of molecules have very high velocity. IV. Between collision, the molecules move in straight lines with constant velocities. Identify the correct statements.

All statements are correct. According to kinetic theory of gases collisions are perfectly elastic. Heavier Gaseous State 14 molecules transfer more momentum to the wall of container. Only a small number of molecules have very high velocity due to high kinetic energy. Between collision, the molecules move in straight lines with constant velocities.