Answer: Between 1 nm and 1000 nm.
- A Less than 1 nm
- B Between 1 nm and 1000 nm
- C Greater than 1000 nm only
- D Exactly 1 mm
Correct answer: B. Between 1 nm and 1000 nm
Explanation: Colloidal particles have diameters roughly between 1 nm and 1000 nm, larger than true solutions but smaller than suspensions.
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.