Answer: van der Waals forces.
- A covalent bonding
- B van der Waals forces
- C ionic attractions
- D metallic bonding forces
Correct answer: B. van der Waals forces
Explanation: Physical adsorption (physisorption) is due to weak van der Waals attractions between adsorbate and adsorbent.
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.