Answer: Formation of chemical bonds between adsorbate and adsorbent.
- A Mainly weak van der Waals attraction in many documented cases
- B Formation of chemical bonds between adsorbate and adsorbent
- C No interaction between adsorbate and surface according to conventional understanding
- D Mainly physical trapping of gas in pores in routine practice
Correct answer: B. Formation of chemical bonds between adsorbate and adsorbent
Explanation: Chemisorption involves actual chemical bond formation between the adsorbate molecules and the adsorbent surface.
A typical adsorption isotherm: x/m (mass adsorbed per gram of adsorbent) rises steeply at low pressure, then flattens into a saturation plateau as the adsorbent surface fills up.
Concept context
Explore the chemistry that happens at interfaces, from catalysts that speed up industrial reactions to colloids like milk, smoke, and gels that surround us every day.