Real gases deviate most from ideal behaviour at
Correct answer: B. low temperature and high pressure
- A. high temperature and low pressure
- B. low temperature and high pressure
- C. standard temperature and pressure
- D. any temperature, equally
Explanation
Compressing a gas brings the molecules close enough for their own volume and their mutual attractions to matter, and cooling reduces the kinetic energy that would otherwise overcome those attractions. Under the opposite conditions the molecules are far apart and fast moving, so the ideal model works well. Every gas becomes non ideal as it approaches liquefaction.
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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
443 free Gases MCQs from Chemistry, each with the correct answer and an explanation. Unlimited attempts, no account needed.
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