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NEET UG CHEMISTRY MCQ: SOLUTIONS
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At a constant temperature, which of the following aqueous solutions will have the maximum vapour pressure?
(Mol. wt NaCl =58.5,
(Mol. wt NaCl =58.5,
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Correct option: A
1 molal NaCl (aq)
Option A (1 molal NaCl (aq)) is correct because, at a constant temperature, the solution with the lowest effective concentration of solute particles will have the highest vapor pressure. Molality is approximately equal to molarity for dilute aqueous solutions, and NaCl dissociates into two ions.
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Reason: Isotonic solutions have equal osmotic pressure at constant temperature. 0.2 molal aqueous solution of a monobasic acid is 60% ionised. If Kb for water is then the boiling point of the solution will be The vapour pressures of pure liquids and are 400 and 600 mmHg, respectively at 298 K. On mixing the two liquids, the sum of their initial volumes is equal to the volume of the final mixture. The mole fraction of liquid is 0.5 in the mixture. The vapour pressure of the final solution, the mole fractions of components and in vapour phase, respectively are What is molecular weight of a substance whose 7.0% by mass solution in water freezes at . for water is A mixture of ethyl alcohol and propyl alcohol has a vapour pressure of 290 mm at 300 K. the vapour pressure of propyl alcohol is 200 mm. If the mole fraction of ethyl alcohol is 0.6, its vapour pressure (in mm) at the same temperature will be