Question

Gaseous adsorption on solid surface is exothermic because adsorption brings in :

• A. increase in enthalpy
• B. increase in entropy
• C. increase in free energy
• D. interaction forces developed between gaseous molecule and solid surface

Answer 1

Answer: (D)

interaction forces developed between gaseous molecule and solid surface

Gaseous adsorption on solid surface is exothermic because adsorption brings in interaction forces developed between gaseous molecules and solid surface. Heat energy is released during development of these interaction forces.