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(A) Osmotic pressure $(\pi)$ is given by the formula $\pi = iCRT$,where $i$ is the van't Hoff factor,$C$ is the molar concentration,$R$ is the gas con

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$D > B > A > C$

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(A) Osmotic pressure $(\pi)$ is given by the formula $\pi = iCRT$,where $i$ is the van't Hoff factor,$C$ is the molar concentration,$R$ is the gas constant,and $T$ is the temperature.Since $R$ and $T$ are constant,$\pi \propto i 	imes C$.For complete dissociation:$A. 0.2 \ m \ KCl: i = 2, C = 0.2, \pi \propto 2 	imes 0.2 = 0.4$$B. 0.3 \ m \ MgSO_4: i = 2, C = 0.3, \pi \propto 2 	imes 0.3 = 0.6$$C. 0.1 \ m \ BaCl_2: i = 3, C = 0.1, \pi \propto 3 	imes 0.1 = 0.3$$D. 0.5 \ m \ Al_2(SO_4)_3: i = 5, C = 0.5, \pi \propto 5 	imes 0.5 = 2.5$Comparing the values: $2.5 (D) > 0.6 (B) > 0.4 (A) > 0.3 (C)$.Thus,the decreasing order is $D > B > A > C$.

Arrange the following solutions according to decreasing order of osmotic pressure under similar conditions of temperature,assuming complete dissociation:
$A. 0.2 \ m \ KCl$
$B. 0.3 \ m \ MgSO_4$
$C. 0.1 \ m \ BaCl_2$
$D. 0.5 \ m \ Al_2(SO_4)_3$

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Arrange the following solutions according to decreasing order of osmotic pressure under similar conditions of temperature,assuming complete dissociation:$A. 0.2 \ m \ KCl$$B. 0.3 \ m \ MgSO_4$$C. 0.1 \ m \ BaCl_2$$D. 0.5 \ m \ Al_2(SO_4)_3$