MHT CET 2024 Chemistry question
In a solution mole function of solute is 0·2 when lowering in vapour pressure is 10 mmHg. To get lowering of vapour pressure of 20 mm Hg, mole fraction of solution in solution is
Answer: (B)
Solution
Raoult's law for a non-volatile solute gives the relative lowering of vapour pressure equal to the mole fraction of the solute: , so at a fixed temperature. Case 1: , so mmHg. Case 2: $20 =
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