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NEET UG CHEMISTRY MCQ: SOLUTIONS
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Consider the following statements about osmotic pressure method of molar mass determination.
I. Molarity of the solution is used instead of molality.
II. Magnitude of osmotic pressure is very large even for dilute solutions.
III. Molar mass of biomolecules can be determined as they are not stable at higher temperatures.
IV. Determine the molar mass of polymer as they have poor solubility.
Which of the above statements are responsible for advantage of osmotic pressure for determination of molar mass over the other colligative properties?
I. Molarity of the solution is used instead of molality.
II. Magnitude of osmotic pressure is very large even for dilute solutions.
III. Molar mass of biomolecules can be determined as they are not stable at higher temperatures.
IV. Determine the molar mass of polymer as they have poor solubility.
Which of the above statements are responsible for advantage of osmotic pressure for determination of molar mass over the other colligative properties?
View answer and explanation
Correct option: C
I, II, III and IV
Option C is correct because all the statements (I, II, III, and IV) highlight the advantages of using osmotic pressure for molar mass determination, especially for biomolecules and polymers.
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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
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