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
  • D
    all have same

Answer

Correct option: B.
$200 \,mL\,\,1\,M$ glucose solution
b
$\pi= CRT$

$\pi \rightarrow$ 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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