Which of the following statements are consistent with the kinetic theory of ideal gases?

AGas molecules move in straight lines between collisions
BThe average distance between molecules is large compared with their size
CThe pressure of a gas is independent of the molecular mass at fixed $n$ , $V$ and $T$
DGas molecules have the same speed at a given temperature

Answer: A, B, C

Straight-line motion between collisions (A) and negligible molecular volume (B) are postulates.

P = n RT / V

does not involve

M

(C). Molecular speeds are distributed over a wide range (Maxwell distribution), so (D) is wrong.