For an ideal gas, which one of the following statements does not hold true?

A The speed of all gas molecules is same
B The kinetic energies of all gas molecules are not same
C The potential energy of the gas molecules is zero
D There is no interactive force between the molecules.

Correct Answer: The speed of all gas molecules is same

In an ideal gas, at any particular time, different particles in the gas have different speeds and hence different kinetic energies. This assumption is reasonable because as the particles collide, we expect their speed to change. Even if initial speed of all the particles was same, the molecular collisions will disrupt this uniformity.Hence statement 1 is incorrect and 2 is correct.

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