Which of the following is a colligative property?

• A. Color
• B. Boiling point elevation
• C. Density
• D. Viscosity

Answer: (B)

Verified step by step guidance

1. Understand that colligative properties depend on the number of solute particles in a solvent, not on the type or identity of the solute particles.
2. Recall the common colligative properties: vapor pressure lowering, boiling point elevation, freezing point depression, and osmotic pressure.
3. Analyze each option: Color depends on the nature of the substance, not the number of particles, so it is not a colligative property.
4. Density and viscosity depend on the physical characteristics and interactions of molecules, not solely on the number of solute particles, so they are not colligative properties.
5. Boiling point elevation occurs because adding solute particles lowers the vapor pressure, requiring a higher temperature to boil, making it a classic example of a colligative property.