alleryPhysical adsorption of a gas by a solid is generally:
AInstant only
BReversible
CIrreversible
DImpossible
Answer & Solution
Correct answer: B. Reversible
1. The gas is held only by weak forces in this case.
2. Lowering the pressure lets the gas go again.
3. So physical adsorption is generally reversible.
_Source: syllabus Chemistry Part I, Chapter 5, Surface Chemistry._
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