Question

Elevation of boiling point and depression of freezing point are examples of:

• A. Chemical properties
• B. Colligative properties
• C. Thermal properties
• D. Physical constants

Hint:

Shortcut: If a property depends on number of dissolved particles, think colligative property.

Answer 1

The Correct Option is B

Concept:
Colligative properties depend only on the number of solute particles present, not on their chemical nature.

Step 1:
Boiling point increases when a non-volatile solute is added. Freezing point decreases when solute is dissolved.

Step 2:
Main colligative properties are:
• Relative lowering of vapor pressure
• Elevation of boiling point
• Depression of freezing point
• Osmotic pressure

Step 3:
Both listed effects belong to colligative properties.

Step 4:
Hence the correct answer is option (B).