Which of the following gases can not be liquefied?
Correct answer: B. H₂ and He
- A. Ne and CO
- B. H₂ and He
- C. CO₂ and CO
- D. H₂ and O₂
Explanation
Hydrogen and Helium are the smallest of all elements. They are non-polar in nature; it is not easy to operate attractive forces between them. So they cannot be liquefied by Linde's method which is used to liquefy air.
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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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