$A$ semipermeable membrane is that which permits the passage of:

The osmotic pressure of a solution is given by the relation

Consider separate solutions of $0.500 \, M \, C_2H_5OH \, (aq)$,$0.100 \, M \, Mg_3(PO_4)_2 \, (aq)$,$0.250 \, M \, KBr \, (aq)$ and $0.125 \, M \, Na_3PO_4 \, (aq)$ at $25 ^\circ C$. Which statement is true about these solutions,assuming all salts to be strong electrolytes?

If the osmotic pressure of a solution at $300 \ K$ is $0.0821 \ atm$,what will be the concentration of the solution in $mol/L$?

Which one of the following pairs of solutions can we expect to be isotonic at the same temperature?

The empirical formula of a non-electrolyte is $CH_2O$. $A$ solution containing $3 \ g$ of the compound exerts the same osmotic pressure as that of $0.05 \ M$ glucose solution. The molecular formula of the compound is