Adsorption happens because surface particles carry forces that are:
AWholly absent
BEvenly shared
CUnbalanced
DFully paired
Answer & Solution
Correct answer: C. Unbalanced
1. A particle inside the solid is pulled equally from all sides.
2. One at the surface has no neighbours above it.
3. So it carries unbalanced, or residual, attractive forces.
_Source: NCERT Class 12 Chemistry Part I, Chapter 5, Surface Chemistry._
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