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JEE Main levelSingle correct optionDifficulty 2 of 3sc013

Critical temperatures (in K) are: 33, 126, 304, 405. Assuming only physisorption on charcoal at the same temperature and pressure, the gas adsorbed to the greatest extent is:

  1. A
  2. B
  3. C
  4. D

Answer: C

Physisorption depends on van der Waals forces, which are stronger for gases that liquefy more easily, i.e. those with higher critical temperature. has the highest value (), so it is adsorbed most.
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