Isotonic solutions are the solutions with:
Answer & explanation
Correct answer: option 3
The correct answer is Option (3) → Same osmotic pressure
Isotonic solutions have the same osmotic pressure at a given temperature, so no osmosis occurs between them. For two solutions at the same temperature, π = iCRT, so isotonic solutions have the same concentration of solute particles. A 0.9% (mass/volume) NaCl solution is isotonic with the fluid inside blood cells; that is why it is used for intravenous injection.
NCERT (2026-27 edition):
Osmosis and Osmotic Pressure – …
