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Molecules of an ideal gas move with different speeds.

1. In an ideal gas, the intermolecular forces of attraction are negligible and hence, it cannot be liquefied.
2. In the equation PV = nRT, n moles of the gas have volume V.
3. In van der Waals equation, n moles of gas occupies volume V and exert pressure P at a temperature T.
4. At low pressure and high temperature correction for 1 mole of a gas is negligible, i.e. the effect of a/V² and b becomes negligible. Thus, the gas equation becomes PV = nRT.

Correct answer: At low pressure and high temperature correction for 1 mole of a gas is negligible, i.e. the effect of a/V² and b becomes negligible. Thus, the gas equation becomes PV = nRT.

Solution

Option D is correct because at low pressure and high temperature, the deviations from ideal gas behavior are minimal, making the van der Waals corrections negligible and the gas equation approximate to PV = nRT.

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