Multiple choice

Which of the following is a wrong statement regarding the postulates of kinetic theory of gases?

  1. The molecular density of the gas remains unchanged throughout the gas.

  2. The molecules of gases possess potential energy & kinetic energy.

  3. The molecules of a gas obey Newton's laws of motion.

  4. The collisions are perfectly elastic in nature.
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B Correct answer
Explanation

The molecules of gases do not exert any force of attraction or repulsion on each other, except at the time of collision. Thus, the molecules do not have any potential energy. Their energy is only kinetic energy.

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