Which two assumptions of the Kinetic-Molecular Theory need to be altered to acco

Question

Which two assumptions of the Kinetic-Molecular Theory need to be altered to account for the behavior of real gases?

I. gas molecules have no volume

II. gas molecules move in random motion

III. gas molecules undergo no attractive or repulsive force toward one another

IV. gas molecules undergo perfectly elastic collision

A. I and III B. II and IV C. II and III D. III and IV E. I and II

I think its either A. or D. but im not sure.
Also, please EXPLAIN your answer. If you don't explain it I will rate it 1 star.

Explanation / Answer

D. III and IV Postulates A gas consists of a collection of small particles traveling in straight-line motion and obeying Newton's Laws. The molecules in a gas occupy no volume (that is, they are points). Collisions between molecules are perfectly elastic (that is, no energy is gained or lost during the collision). There are no attractive or repulsive forces between the molecules. The average kinetic energy of a molecule is 3kT/2. (T is the absolute temperature and k is the Boltzmann constant.)

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