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Standard XII

Chemistry

Relative Lowering of Vapour Pressure

Which of the ...

Question

Which of the following colligative properties can provide molar mass of proteins (or polymers orcolloids) with greater precision?

Relative lowering of vapour pressure

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Elevation of boiling point.

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Depression in freezing point

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Osmotic pressure

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Solution

The correct option is D Osmotic pressure
Measurement of osmotic pressure provides a method to determine molar masses of solutes. This method is widely used to determine molar masses of proteins, polymers and other macromolecules.
Hence, option D is correct.

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Similar questions

Which of the following colligative properties can provide molar mass of proteins (or polymers or colloids) with greater precision

Which of the following colligative property can provide molar mass of proteins ( or polymers or colloids) with greater precision?

Q. Consider the following statements and arrange in the order of true/false as given in the codes.

S_{1}

: Vapour pressure is a colligative property.

S_{2}

: Freezing point of a solution is always lower than that of the pure solvent.

S_{3}

: Acetic acid undergoes association in benzene. The molar mass of acetic acid, determined by elevation of boiling point is always higher than its normal molar mass.

S_{4}

: Osmotic pressure measurements can be used for determination of molar mass of polymers.

Q. From the colligative properties of solution which one is the best method for the determination of molar mass of proteins and polymers :

Properties such as boiling point, freezing point and vapour pressure of a pure solvent change when solute molecules are added to get homogeneous solution. These are called colligative properties. Applications of colligative properties are very useful in day-to – day life.

One of its examples is the use of ethylene glycol and water mixture as anti-freezing liquid in the radiator of automobiles.

A solution M is prepared by mixing ethanol and water. The mole fraction of ethanol in the mixture is 0.9.

Given, freezing point depression constant of water

$(K_{f}^{w a t e r}) = 1.86 K k g m o l^{- 1}$

Freezing point depression constant of ethanol

$(K_{b}^{w a t e r}) = 2.0 K k g m o l^{- 1}$

Boiling point elevation constant of water

$(K_{b}^{w a t e r}) = 0.52 K k g m o l^{- 1}$

Boiling point elevation constant of ethanol

$(K_{b}^{e t h a n o l}) = 1.2 K k g m o l^{- 1}$

Standard freezing point of water = 273 K

Standard freezing point of ethanol = 155.7 K

Standard boiling point of water = 373 K

Standard boiling point of ethanol = 351.5K

Vapour pressure of pure water = 32.8 mm Hg

Vapour pressure of pure ethanol = 40 mm Hg

Molecular weight of water $= 18 g m o l^{- 1}$

Molecular weight of ethanol $= 46 g m o l^{- 1}$

In answering the following questions, consider the solutions to be ideal dilute solutions and solutes to be non-volatile and non-dissociative.

The vapour pressure of the solution M is

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Which of the following colligative properties can provide molar mass of proteins (or polymers orcolloids) with greater precision?

The correct option is D Osmotic pressureMeasurement of osmotic pressure provides a method to determine molar masses of solutes. This method is widely used to determine molar masses of proteins, polymers and other macromolecules.Hence, option D is correct.

The correct option is D Osmotic pressure
Measurement of osmotic pressure provides a method to determine molar masses of solutes. This method is widely used to determine molar masses of proteins, polymers and other macromolecules.
Hence, option D is correct.