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For ideal gases: 1. Molecular size is negligible. 2. There is no intermolecular attraction. 3. Inelastic collisions occur.

1. 1 and 2 only
2. 1 and 3 only
3. 2 and 3 only
4. 1, 2 and 3

Correct answer: 1 and 2 only

Solution

An ideal gas is assumed to have negligible molecular volume and no intermolecular forces. Its collisions are perfectly elastic, not inelastic, so statement 3 is incorrect.

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