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Which of the following statements is incorrect regarding physisorption?

  1. A
    It occurs because of van der Waals forces.
  2. B
    More easily liquefiable gases are adsorbed readily.
  3. C
    Under high pressure it results into multimolecular layer on adsorbent surface.
  4. D
    Enthalpy of adsorption () is low and positive.

Solution & Step-by-step Explanation

Adsorption is an exothermic process because it involves the decrease of residual forces on the surface. Thus, is always negative. For physisorption, the magnitude of enthalpy of adsorption is low (typically ) but it is negative, not positive.

Practice this question

Try it yourself before checking the explanation above.

Which of the following statements is incorrect regarding physisorption?
A
It occurs because of van der Waals forces.
B
More easily liquefiable gases are adsorbed readily.
C
Under high pressure it results into multimolecular layer on adsorbent surface.
D
Enthalpy of adsorption () is low and positive.

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Physical ChemistrySurface ChemistryAdsorption

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