MCQ
Which will have minimum Osmotic pressure?
- A$200\,mL\,\,2\,M\,NaCl$ solution
- ✓$200 \,mL\,\,1\,M$ glucose solution
- C$200\, mL\,\,2\,M$ urea solution
- Dall have same
✓
Answer
Correct option: B.
$200 \,mL\,\,1\,M$ glucose solution
b
$\pi= CRT$
$\pi= CRT$
$\pi \rightarrow$ osmotic pressure
$C \rightarrow$ molarity
$NaCl$ is a strong electrolyte
$\pi_{ a }=2 RT$ ( $\because NaCl$ gives two ions on dissociation)
$\pi_{ b }= RT$ for glucose
$\pi_{ c }=2 RT$ for urea
$\therefore$ Glucose solution has minimum osmotic pressure
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