Question:
Which of the following is not a colligative property?
Which of the following is not a colligative property?
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Colligative properties are independent of solute type and depend on solute particle concentration.
Updated On: Jan 13, 2026
- Osmotic pressure
- Depression of freezing point
- Elevation of boiling point
- Refractive index
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The Correct Option is D
Solution and Explanation
Step 1: Define colligative properties
Colligative properties include:
- Osmotic pressure: Pressure required to prevent osmosis, proportional to solute concentration.
- Depression of freezing point: Lowering of freezing point, proportional to molality.
- Elevation of boiling point: Increase in boiling point, proportional to molality.
- Vapor pressure lowering: Decrease in vapor pressure due to solute particles.
Step 2: Analyze each option
- Osmotic pressure: Depends on the number of solute particles (van’t Hoff factor times concentration). Colligative.
- Depression of freezing point: Depends on molality and the number of solute particles. Colligative.
- Elevation of boiling point: Depends on molality and solute particle concentration. Colligative.
- Refractive index: Measures how light bends in a medium. It depends on the chemical nature of both solute and solvent, not just the number of particles. Not colligative.
Step 3: Conclusion
Refractive index is not a colligative property.
Colligative properties include:
- Osmotic pressure: Pressure required to prevent osmosis, proportional to solute concentration.
- Depression of freezing point: Lowering of freezing point, proportional to molality.
- Elevation of boiling point: Increase in boiling point, proportional to molality.
- Vapor pressure lowering: Decrease in vapor pressure due to solute particles.
Step 2: Analyze each option
- Osmotic pressure: Depends on the number of solute particles (van’t Hoff factor times concentration). Colligative.
- Depression of freezing point: Depends on molality and the number of solute particles. Colligative.
- Elevation of boiling point: Depends on molality and solute particle concentration. Colligative.
- Refractive index: Measures how light bends in a medium. It depends on the chemical nature of both solute and solvent, not just the number of particles. Not colligative.
Step 3: Conclusion
Refractive index is not a colligative property.
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