MHT CET 2025 Chemistry question

Which from following pairs of solutions in water exhibits same osmotic pressure at same temperature? [molar mass of urea = 60 g , sucrose = 342 g ]

(A)3 g urea and 17.1 g sucroseCorrect
(B)6 g urea and 17.1 g sucrose
(C)3 g urea and 34.2 g sucrose
(D)6 g urea and 8.6 g sucrose

Answer: (A)

Solution

Osmotic pressure and both solutes are non-electrolytes, so at the same temperature solutions have equal osmotic pressure when their molar concentrations are equal. Convert each: urea 3 g/L = 3/60 = 0.05 M; urea 6 g/L = 0.10 M; sucrose

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Question ID VK-102825