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ExamsJEE MainChemistry

Consider the van der Waals constants, a and b, for the following gases. Gas: Ar, Ne, Kr, Xe a/(atm dm^6 mol^-2): 1.3, 0.2, 5.1, 4.1 b/(10^-2 dm^3 mol^-1): 3.2, 1.7, 1.5, 0.9 Which gas is expected to have the highest critical temperature?

  1. Kr
  2. Ne
  3. Xe
  4. Ar

Correct answer: Kr

Solution

Kr has the highest critical temperature among the given gases because it has a larger van der Waals 'a' constant, indicating stronger intermolecular forces, which typically lead to a higher critical temperature.

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