Question:
Which among the following is NOT colligative property?
Which among the following is NOT colligative property?
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Chemistry Tip: Always look for words like "lowering," "elevation," or "depression." These refer to the change in property, which is what makes it colligative.
Updated On: Apr 23, 2026
- Vapour pressure lowering
- Boiling point
- Freezing point depression
- Osmotic pressure
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The Correct Option is B
Solution and Explanation
Concept:
Chemistry (Solutions) - Colligative Properties.
Step 1: Define Colligative Properties. Colligative properties are properties of solutions that depend solely on the number of solute particles present, regardless of their chemical identity.
Step 2: Identify the standard colligative properties.
• Relative Lowering of Vapour Pressure: The decrease in vapor pressure upon adding a non-volatile solute.
• Elevation of Boiling Point: The increase in boiling temperature.
• Depression of Freezing Point: The decrease in freezing temperature.
• Osmotic Pressure: The pressure needed to stop osmosis.
Step 3: Compare the options. While elevation of boiling point is a colligative property, the boiling point itself is a characteristic physical property of a substance and is not colligative. $$ \therefore \text{Boiling point is NOT a colligative property.} $$
Step 1: Define Colligative Properties. Colligative properties are properties of solutions that depend solely on the number of solute particles present, regardless of their chemical identity.
Step 2: Identify the standard colligative properties.
• Relative Lowering of Vapour Pressure: The decrease in vapor pressure upon adding a non-volatile solute.
• Elevation of Boiling Point: The increase in boiling temperature.
• Depression of Freezing Point: The decrease in freezing temperature.
• Osmotic Pressure: The pressure needed to stop osmosis.
Step 3: Compare the options. While elevation of boiling point is a colligative property, the boiling point itself is a characteristic physical property of a substance and is not colligative. $$ \therefore \text{Boiling point is NOT a colligative property.} $$
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