Answer: It becomes independent of pressure, reaching saturation.
- A It increases indefinitely with pressure in typical laboratory settings
- B It becomes independent of pressure, reaching saturation
- C It becomes directly proportional to pressure under usual circumstances
- D It drops to zero according to most researchers in the majority of cases studied
Correct answer: B. It becomes independent of pressure, reaching saturation
Explanation: At high pressure, the Freundlich isotherm predicts x/m approaches a constant saturation value, independent of further pressure increase.
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.