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(A) Osmotic pressure $(\pi)$ is a colligative property given by $\pi = iCRT$,where $i$ is the van't Hoff factor. Since $C$,$R$,and $T$ are constant,$\

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Aluminium sulphate

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(A) Osmotic pressure $(\pi)$ is a colligative property given by $\pi = iCRT$,where $i$ is the van't Hoff factor. Since $C$,$R$,and $T$ are constant,$\pi$ depends on $i$. $i = 1 + \alpha(n-1)$,where $\alpha = 0.9$. For $A$: $Al_2(SO_4)_3 \rightarrow 2Al^{3+} + 3SO_4^{2-}$,$n=5$,$i = 1 + 0.9(4) = 4.6$. For $B$: $BaCl_2 \rightarrow Ba^{2+} + 2Cl^-$,$n=3$,$i = 1 + 0.9(2) = 2.8$. For $C$: $Na_2SO_4 \rightarrow 2Na^+ + SO_4^{2-}$,$n=3$,$i = 1 + 0.9(2) = 2.8$. For $D$: Mixture of $B$ and $C$ results in an average $i$ value between $2.8$ and $2.8$,which is $2.8$. Thus,$Al_2(SO_4)_3$ has the maximum $i$ value and hence the maximum osmotic pressure.

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

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