Question

Isotonic solutions have equal

• A. osmotic pressure
• B. vapour pressure
• C. relative lowering of vapour pressure
• D. elevation of boiling point

Hint:

Isotonic solutions have the same osmotic pressure, which results in no net movement of solvent across a semipermeable membrane.

Answer 1

The Correct Option is A

Step 1: Define isotonic solutions.
Isotonic solutions are solutions that have the same osmotic pressure. This means that the concentration of solute particles in both solutions is the same, and there is no net movement of solvent when these solutions are separated by a semipermeable membrane.
Step 2: Apply to the options.
- Osmotic pressure is the pressure required to stop osmosis. Isotonic solutions must have equal osmotic pressure by definition. - The other options (vapour pressure, relative lowering of vapour pressure, and elevation of boiling point) are not necessarily equal in isotonic solutions.
Final Answer: \[ \boxed{\text{osmotic pressure}} \]