QUESTION: Which of the following is not a colligative property?
A Osmotic pressure
B Optical activity
C Depression in Freezing point
D Elevation in Boiling point
ANSWER: Optical activity
| Colligative Property | Definition | Importance |
| Introduction | Colligative properties are physical properties of a solution that depend solely on the number of solute particles and not on their nature. | These properties provide insight into solution behavior and concentration effects. |
| Types
|
Lowering of vapor pressure: The vapor pressure of a solvent in a solution is lower due to the presence of solute particles. |
Used in industries, like antifreeze in cars, to lower the freezing point. |
|
Elevation of boiling point: The boiling point of a solution is higher than that of the pure solvent. |
Used in cooking, making candy, and in industrial processes. | |
| Depression of freezing point: The freezing point of a solution is lower than that of the pure solvent. | Used in winter road salt, preserving foods, and cryopreservation. | |
| Osmotic Pressure: The pressure required to prevent osmosis across a semipermeable membrane. | Essential for biological processes, like cell functioning and filtration. |