The compound that would have the highest osmotic pressure when dissolved in water is [tex]FeCl_{3}[/tex] .
So, option D is correct one.
The dissociation of one molecule of [tex]FeCl_{3}[/tex] gives the maximum number of ions when dissolved in water ( 4 ions ) . Osmotic pressure is a colligative property and depends upon number of solute particles present in the solution . The solution having maximum number of solute particles will have maximum number of the osmotic pressure .
All other given molecules gives less number of number of ions when dissolved in water as compare to of [tex]FeCl_{3}[/tex] .
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