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. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
• B. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
• C. Assertion is correct but Reason is incorrect
• D. Both Assertion and Reason are incorrect

Answer 1

The correct option is C Assertion is correct but Reason is incorrect

Osmosis 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, $({\psi }_s=-\pi )$.

So, the correct answer is 'Assertion is correct but Reason is incorrect'.