Question

At $25^\circC$ the highest osmotic pressure is exhibited by 0.1 M solution of ________.

• A. urea
• B. glucose
• C. KCl
• D. $CaCl_{2}$

Hint:

At $25

Answer 1

The Correct Option is D

Step 1: Formula
Osmotic pressure $\pi = iCRT$. It is a colligative property depending on the number of particles ($i$).
Step 2: Particle Analysis
- Urea: $i = 1$ (non-electrolyte)
- Glucose: $i = 1$ (non-electrolyte)
- KCl: $K^{+} + Cl^{-}$ ($i = 2$)
- $CaCl_{2}$: $Ca^{2+} + 2Cl^{-}$ ($i = 3$)
Step 3: Conclusion
$CaCl_{2}$ produces the maximum number of ions, hence the highest osmotic pressure.
Final Answer: (D)