MHT CET 2024 Chemistry question

Which of following solution will not show flow of solvent in either direction when separated by semipermeable membrane.

(A)6 g urea dm and 85.5 g sucrose dm
(B)15 g urea dm and 34.2 g sucrose dm
(C)6 g urea dm and 34.2 g sucrose dmCorrect
(D)15g urea dm and 171 g sucrose dm

Answer: (C)

Solution

No net flow of solvent across a semipermeable membrane occurs when the two solutions are isotonic, i.e. have the same molar concentration (same osmotic pressure, since both solutes are non-electrolytes). Molar masses: urea g mol, sucrose g mol. Concentrations: 6 g urea dm M;

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Question ID VK-096662