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Question

Consider the given statements regarding the behavior of ideal gases:

1. Ideal gas molecules have negligible volume compared to the total volume of the container.
2. There are strong intermolecular attractive forces between ideal gas molecules.
3. Collisions between ideal gas molecules are perfectly elastic.

Which of the statements given above is/are correct?

This question was previously asked in
SSC CGL 2025 Tier 2 Paper 1 Question Paper (19-Jan-2026)
The correct answer is

1 and 3 only

Statement 1: Correct. One of the key assumptions of ideal gas theory is that molecules are point masses with negligible volume relative to the container.

Statement 2: Incorrect. Ideal gas molecules are assumed to have no intermolecular forces (neither attractive nor repulsive) between them — this is a fundamental postulate of the ideal gas model.

Statement 3: Correct. Collisions between ideal gas molecules (and between molecules and container walls) are assumed to be perfectly elastic — kinetic energy is conserved.

Hence, 1 and 3 only are correct.

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