SATHEE: Solutions Question 358

Solutions Question 358

Question: $π_{1}, π_{2}, π_{3}$ and $π_{4}$ atm are the osmotic pressures of 5% (mass/volume) solutions of urea, fructose, sucrose and $K C l$ respectively at certain temperature. The correct order of their magnitudes is:

Options:

A) $π_{1} > π_{4} > π_{2} > π_{3}$

B) $π_{1} > π_{4} > π_{2} > π_{3}$

C) $π_{4} > π_{1} > π_{2} > π_{3}$

D) $π_{4} > π_{1} > π_{3} > π_{2}$

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Answer:

Correct Answer: C

Solution:

Moles of urea $= \frac{5}{60};$ moles of fructose $= \frac{5}{180};$

$C_{u r e a} = \frac{0.08 \times 1000}{100} \Rightarrow 0.833$ moles of sucrose $= \frac{5}{342};$

$C_{s u c r o s e} = 0.0146 \times \frac{1000}{100} = 0.146$ moles of $K C l$ (effective) $= 2 \times \frac{5}{74.5} = \frac{5}{37.25}; \frac{0.134 \times 1000}{100} = 1.34$

$π \propto C$ this order is $π_{4} > π_{1} > π_{2} > π_{3}$

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Solutions Question 358

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:

Options:

Answer:

Solution:

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Question: $π_{1}, π_{2}, π_{3}$ and $π_{4}$ atm are the osmotic pressures of 5% (mass/volume) solutions of urea, fructose, sucrose and $K C l$ respectively at certain temperature. The correct order of their magnitudes is: