Question

Two isotonic solutions cannot have the same value of

• A. osmotic pressure
• B. density
• C. elevation in boiling point
• D. depression in freezing point

Hint:

Isotonic = same osmotic pressure, but other properties like density can differ.

Answer 1

The Correct Option is B

Step 1: Define isotonic solutions.
Two solutions are isotonic if they have the same osmotic pressure (\(\pi\)) at a given temperature.
Step 2: Colligative properties.
Osmotic pressure, elevation in boiling point, and depression in freezing point are colligative properties — they depend only on the number of solute particles, not on their nature.
Step 3: Density check.
Density is not a colligative property; it depends on both the solute and solvent type. Thus, isotonic solutions may have different densities.
Final Answer: \[ \boxed{\text{density}} \]