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At 25°C, the highest osmotic pressure is exhibited by 0.1 M solution of

1. CaCl₂
2. KCl
3. Glucose
4. Urea

Correct answer: CaCl₂

Solution

Osmotic pressure depends on the van 't Hoff factor (i), which accounts for the number of particles in solution. CaCl₂ dissociates into 3 particles (1 Ca²⁺ and 2 Cl⁻), giving it the highest i value among the options, and thus the highest osmotic pressure.

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