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I can't figure this out:

Which of the following are true:

1. Diffusion of gases involves the random collision of gas molecules.

2. According to Van der Waals equation for gases, at low pressure, volume of the gas increases, thus making them behave more ideally.

3. According to Kinetic Molecular Theory of gases, we cannot ignore the effect of the intermolecular forces on gases.

4. The effect of intermolecular forces on gases can be minimized by decreasing the volume of the system.

5. The average KE for a gas at a given temperature can be changed by increasing or decreasing the volume of a system

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