alleryPhysisorption shows no preference for a particular gas, so it lacks:
ASpecificity
BReversibility
CExothermicity
DUniversality
Answer & Solution
Correct answer: A. Specificity
1. Van der Waals forces act between all molecules alike.
2. So any surface will take up any gas to some extent.
3. Physisorption therefore lacks specificity.
_Source: syllabus Chemistry Part I, Chapter 5, Surface Chemistry._
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