Question

π₁, π₂, π₃ and π₄ atm are the osmotic pressures of 5% (mass/
volume) solutions of urea, fructose, sucrose and KCl
respectively at certain temperature. The correct order of their
magnitudes is :
(a) π₁ > π₄ > π₂ > π₃ (b) π₁ < π₄ < π₂ < π₃
(c) π₄ > π₁ > π₂ > π₃ (d) π₄ > π₁ > π₃ > π₂

Answer 1

The correct order  of their  magnitudes is π₄ > π₁ > π₂ > π₃

Option (C) is correct.

Explanation:

Number of moles of urea and fructose are given below.

• Moles of urea = 5 / 60
• Moles of fructose = 5 / 180
• Moles of sucrose = 5 / 342
• Moles of KCl (effective)
• Moles of KCl  =2 × 5 / 74.5
• Moles of KCl  = 5 / 37.25

Thus the correct order  of their  magnitudes is π₄ > π₁ > π₂ > π₃

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