Which has highest value of critical temprature?
Correct answer: B. Ammonia
- A. Helium
- B. Ammonia
- C. Oxygen
- D. CO2
Explanation
Correct. Ammonia has a high critical temperature of ~405.5 K because of strong hydrogen bonding between its molecules, which increases intermolecular forces and raises the temperature at which it can remain in a liquid state under pressure.
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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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