MCQ
Which will have minimum osmotic pressure ?
- A$200\, mL$ of $2\,M \,NaCl$ solution
- ✓$200\, mL$ of $1\, M$ glucose solution
- C$200\, mL$ of $2\,M$ urea solution
- DAll have same
✓
Answer
Correct option: B.
$200\, mL$ of $1\, M$ 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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