Question

Which observation indicates that the kinetic-molecular theory has limited use for describing a certain gas?
Gas particles are acting like tiny, solid spheres.
Gas particles are obeying Newton’s laws of motion.
Increasing pressure is reducing the volume of the gas.
Increasing collisions of gas molecules will increase energy between them.

Answer 1

Gas particles are acting like tiny, solid spheres.

Reason: The kinetic‑molecular theory for ideal gases assumes particles have negligible volume and no intermolecular forces. If the particles behave like solid spheres (i.e., have significant volume), that violates the theory’s assumptions and shows it has limited applicability.