Question

Assertion : Osmotic pressure is numerically equivalent to the osmotic potential.
Reason : Osmotic pressure is the negative pressure applied, while osmotic potential is positive.

• A. If both assertion and reason are true and reason is the correct explanation of assertion
• B. If both assertion and reason are true but reason is not the correct explanation of assertion
• C. If assertion is true but reason is false
• D. If both assertion and reason are false

Answer 1

Answer: (C)

Osmotic pressure is defined as the pressure required to completely stop the entry of water into an osmotically active solution across a semipermeable membrane. Thus water will move from a region of low osmotic pressure to a region of high osmotic pressure. It is measured in atmospheres, bars or pascals. Osmotic pressure is numerically equal to osmotic potential ($=$ solute potential, ${\Psi }_s$) but osmotic potential has a negative value, while osmotic pressure ($\pi$, pi) has a positive value, $\left({\Psi }_s=-\pi \right)$.