The flow of solvent from pure solvent side to solution side across a semipermeable membrane can be stopped if some extra pressure is applied on the solution. This pressure that just stops the flow of solvent is called
Answer & explanation
Correct answer: option 1
The correct answer is Option (1) → Osmotic pressure of solution
The pressure that just stops osmosis is the osmotic pressure of the solution. For a dilute solution it is proportional to the molar concentration of the solute:
\( \displaystyle \Pi = CRT \)
NCERT (2026-27 edition):
Osmosis and Osmotic Pressure – “… The flow of the solvent from its side to solution side across a semipermeable membrane can be stopped if some extra pressure is applied on the solution. This pressure that just stops the flow of solvent is called osmotic pressure of the solution.”