Blood has been found to be isotonic with

An aqueous solution of $0.6 \% (w/v)$ urea is isotonic with which of the following?

What does a semi-permeable membrane allow to pass through?

$A$ $0.002 \, M$ solution of $NaCl$ having a degree of dissociation of $90 \%$ at $27 \, ^{\circ}C$ has an osmotic pressure equal to:

$A$ solution of polystyrene in benzene contains $10 \, g/L$. The equilibrium height of the column of solution having density $0.9 \, g/mL$ in the osmometer is $11 \, cm$ at $27 \, ^\circ C$. What is the average molar mass of polystyrene? (Assume the solution is ideal)

The osmotic pressure of a dilute solution is given by