Which of the following gases shows more ideal behaviour at 0°C___________?
Correct answer: C. He
- A. H2
- B. CH4
- C. He
- D. NH3
Explanation
Helium behaves most ideally because its atoms are very small and have extremely weak intermolecular attractions, so deviations from the ideal-gas assumptions are minimal. Ammonia has strong attractions, while methane and hydrogen show somewhat greater non-ideal effects than helium at this temperature. Students may choose H2 because it is also light, but weak attractions and small effective size together make He the better answer.
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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.
Practise Gases
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