.Which one of the following most closely resembles an ideal gas?
Correct answer: D. He
- A. Xe
- B. H2
- C. CO2
- D. He
Explanation
Helium is an inert gas that exists as a single atom, resulting in the lowest conceivable van der Waals dispersion forces. It occupies an approximately negligible volume and possesses a very tiny mass. It is also highly compressible. Because of all of these properties, helium is the most ideal gas. Properties of Ideal Gas: The particles of gas have negligible volume and mass. They are equally sized. They are compressible. They are always in motion, colliding elastically within a container with no energy loss. They take the shape of the container. They behave inertly, i.e., they do not have intermolecular forces.
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About Real and Ideal Gases
An ideal gas is modelled as particles with negligible volume and no intermolecular attraction, obeying Boyle's, Charles's and Avogadro's laws through PV = nRT. Real gases deviate from this behaviour, especially at high pressure and low temperature, because particle volume and attractive forces matter; the van der Waals equation explains these corrections.
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