Question

Which has the maximum osmotic pressure at temperature $T$?

• A. 100 mL of 1 M urea solution
• B. 300 mL of 1 M glucose solution
• C. Mixture of 100 mL of 1 M urea solution and 300 mL of 1 M glucose solution
• D. All are isotonic

Answer 1

The correct option is D All are isotonic

$\pi =MRT$

For dilute solutions, osmotic pressure is proportional to the molarity, C of the solution at a given temperature T.

In this case, at a given temperature T, all solutions have the same molarity 1 M and hence the same osmotic pressure.

Hence, the correct option is $D$