$A$ solution of sodium chloride with a concentration of ...... is isotonic with the fluid inside human red blood cells.

$A$ 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 phenomenon of osmosis involves:

Calculate the osmotic pressure of a solution containing $0.025 \ mol$ of glucose in $100 \ mL$ of water at $300 \ K$. $\left[R = 0.082 \ atm \ dm^3 \ mol^{-1} \ K^{-1}\right]$ (in $atm$)

$0.06 \% (w/v)$ aqueous solution of urea is isotonic with:

The osmotic pressure of which solution is maximum? (Consider that a $0.1 \ M$ solution of each is $90\%$ dissociated.)