A) When attractive forces are dominant in a real gas U internal energy increases by increasing the average molecular separation
B) Isothermal contraction decreases the internal energy when repulsive forces between molecules exist
C) For an ideal gas at constant T internal energy is function of volume only.
D) In case of attractive forces between particle, if the volume of the sample expands isothemlally its dU< 0
Correct Answer: A
Solution :
[a] Constant temperature, \[\to \]For a perfect gas U is independent of volume. \[\to \]In case of attraction (real gases) U increases with volume as molecules on an average go apart \[\to \]If repulsions are dominant the internal energy decreases with isothermal expansion of the gas.
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