According to kinetic theory of gases:

Options

A. collisions are always elastic
B. heavier molecules transfer more momentum to the wall of the container
C. only a small number of molecules have very high velocity
D. between collision, the molecules move in straight lines with constant velocities

Answer

A,B,C,D

Explanation

All the options are valid
(i) it is one of the postulates of kinetic theory of gases
(ii) momentum transferred to the wall of the container `prop` mass
(iii) is valid
(iv) molecules travel in straight lines in the vacant space between the molecules of the gas with constant velocity between the collisions.