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Chemistry Gaseous State ( Not In Syllabus ) General Single Correct MCQ

Published on: August 12, 2026

When attractive forces are dominant in a real gas U internal energy increases by increasing the average molecular separation

Isothermal contraction decreases the internal energy when repulsive forces between molecules exist

For an ideal gas at constant T internal energy is function of volume only.

In case of attractive forces between particle, if the volume of the sample expands isothermally its dU< 0

Text Solution

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The correct answer is:

Constant temperature,

→ For a perfect gas U is independent of volume.

→ In case of attraction (real gases) U increases with volume as molecules on an average go apart

→ If repulsions are dominant the internal energy decreases with isothermal expansion of the gas.

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