Answer: Chemisorption rate often increases with temperature up to an optimum, similar to chemical reactions.
- A Chemisorption decreasing steadily with temperature right from the very start as widely reported
- B Chemisorption rate often increases with temperature up to an optimum, similar to chemical reactions
- C Chemisorption showing no dependence whatsoever on the surrounding temperature in standard practice
- D Chemisorption usually proceeding instantly regardless of the temperature applied under most conditions encountered
Correct answer: B. Chemisorption rate often increases with temperature up to an optimum, similar to chemical reactions
Explanation: Because chemisorption involves bond formation with an activation energy barrier, its rate often increases with temperature up to an optimum, unlike physisorption.
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.