Question

the adsorption of vapor on clean surface is a spontaneous process because

Answer 1

Theory:

Adhesion of atoms, ions, bimolecules or molecules of gas, liquid or dissolved solids to a surface is called adsorption. This process creates a film of the adsorbate –the molecules or atoms being accumulated, on the surface of the adsorbent.

Examples:

Activated charcoal adsorbs gases like CO2 , SO2, Cl2 etc.

Pt or Ni metal kept in contact with a gas adsorbs the gas - Hydrogenation of oils.

Animal charcoal, when added to acetic acid solution and shaken vigorously, adsorbs acetic acid.

Molasses is decolourised by activated charcoal.