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 newtons laws of motion.
increasing pressure is reducing the volume of the gas.
increasing collisions of gas molecules will increase energy between them.

Explanation:

The kinetic - molecular theory assumes gas particles have elastic collisions with no energy loss between them. If increasing collisions increase energy between them, it violates a key assumption of the theory, indicating its limitations. The other options are consistent with the theory. Gas particles being like tiny solid spheres, obeying Newton's laws, and pressure reducing volume are in line with kinetic - molecular theory concepts.

Answer:

Increasing collisions of gas molecules will increase energy between them.