Highest osmotic pressure is shown by a solution of:

0.1 M

Aluminium sulfate

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0.1 M

Potassium Nitrate

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0.1 M

Magnesium Chloride

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0.1 M

Barium Chloride

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Solution

The correct option is C $0.1 M$ Aluminium sulfate
The highest osmotic pressure is shown by a solution of 0.1 M Aluminium sulfate $A l_{2} (S O_{4})_{3}$ .
$A l_{2} (S O_{4})_{3} \to 2 A l^{3 +} + 3 S O_{4}^{2 -}$ .
The dissociation of one molecule of $A l_{2} (S O_{4})_{3}$ gives the maximum number of ions (5 ions).
Osmotic pressure is a colligative property and depends on the number of solute particles present in the solution. The solution having the maximum number of solute particles will have maximum osmotic pressure.
Potassium nitrate $K N O_{3}$ , magnesium chloride $M g C l_{2}$ and barium chloride $B a C l_{2}$ on dissociation will give $2, 3$ and $3$ particles respectiely.

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