Question

At a given temperature, the osmotic pressure of a concentrated solution of a substance _____________.

• A. is higher than that at a dilute solution.
  
• B. is same as that of a dilute solution.
  
• C. cannot be compared with osmotic pressure of dilute solution.
  
• D. is lower than that of a dilute solution.
  

Answer 1

The correct option is A is higher than that at a dilute solution.


Osmotic pressure is a colligative property that depends only on the number of particles of solute dissolved in a definite amount of the solvent and does not depend on the nature of the solute.

The expression for osmotic pressure is given as:

$\pi =CRT$

Where, $\pi$ = osmotic pressure

$C$ = concentration of solution

$T$ = absolute temperature

From the expression, it can be observed that osmotic pressure is directly proportional to the concentration of the solution at a fixed temperature. Thus, the more is the concentration of the solution, the more will be its osmotic pressure. So, on dilution, as the concentration decreases, the osmotic pressure also decreases.

Therefore, at a given temperature, the osmotic pressure of a concentrated solution of a substance is higher than that of a dilute solution.

Hence, option (A) is correct.