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When an ideal gas undergoes unrestricted expansion

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cooling occurs because the molecules lie above inversion temperature

no cooling occurs as no attractive interactions exist among molecules

cooling occurs as molecules collide with each other with loss of energy

cooling does not occur as these do work equal to loss in kinetic energy.

answer is B.

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Detailed Solution

According to postulates of kinetic theory, there is no intermolecular attractions or repulsions between the molecules of ideal gases.
Thus when an ideal gas undergoes unrestrained expansion, no cooling occurs because the molecules do not exert any attractive forces on each other.

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