Question

Isotonic solutions have:

• A. Same boiling point
• B. Same vapour pressure
• C. Same melting point
• D. Same osmotic pressure

Hint:

Isotonic solutions do \textbf{not} necessarily have the same boiling point, freezing point, or vapour pressure— they are defined only by having equal osmotic pressure.

Answer 1

The Correct Option is D

Step 1: Isotonic solutions are defined as solutions that have the same osmotic pressure at a given temperature.
Step 2: Osmotic pressure is a colligative property and depends on the number of solute particles present in the solution.
Step 3: Even if two solutions differ in composition, they are isotonic as long as their osmotic pressures are equal.