Critical temperature for different gases is different and depends upon______________?
Correct answer: D. All of the above
- A. Size of molecule
- B. Shape of molecule
- C. Intermolecular attractions
- D. All of the above
Explanation
Critical temperature is the highest temperature at which a gas can be liquefied by pressure. It depends on the strength of intermolecular attractions, which are influenced by molecular size and shape, so all three listed factors contribute. Students may choose c alone because attractions are the direct cause, but size and shape affect those attractions.
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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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