alleryAdsorption releases heat, so the process is always:
AEndothermic
BIsothermal
CAdiabatic
DExothermic
Answer & Solution
Correct answer: D. Exothermic
1. Adsorption cuts down the residual forces at the surface.
2. The surface energy lost appears as heat.
3. So adsorption is invariably exothermic.
_Source: syllabus Chemistry Part I, Chapter 5, Surface Chemistry._
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