Which is not one of the postulates of the kinetic molecular theory?

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Gas particles move in a straight line between collisions.

The molecules are in a state of constant random motion.

At a constant temp. all the particles have the same speed.

There are no force of attraction between molecules

answer is A.

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Detailed Solution

At a constant temperature all the particles have the same speed is not one of the postulates of the kinetic molecular theory. The speed of every particle is the same. Between molecules, there is no attraction force. In between collisions, gas particles travel in a straight path. The molecules are constantly moving randomly.

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