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Relative Lowering of Vapour Pressure

The best coll...

Question

The best colligative property used for the determination of molecular masses of polymers is:

A

relative lowering in vapour pressure

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B

osmotic pressure

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C

elevation in boiling point

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D

depression in freezing point

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Solution

The correct option is C osmotic pressure
As compared to other colligative properties, osmotic pressure, its magnitude is large even for very dilute solutions.

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Similar questions

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. Which of the following colligative property is useful to determine molecular masses of polymer compounds from their solutions?

Q. The experimental values of colligative properties of many solutes in solution resembles calculated values of colligative properties.
However in some cases, the experimental values of colligative properties differ widely than those obtained by calculations. Such experimental values of colligative properties are known as abnormal values of colligative properties. The causes for abnormal values of colligative properties are:
(i) Dissociation of solute: It increases the colligative properties.
e.g.: Dissociation of

KCl, NaCl

H_{2} O

.
(ii) Association of solute: It decreases the colligative properties.
e.g.: Dimerisation of acetic acid in benzene.

One mole of

I_{2}

(solid. is added in

1 M

KI

solution. Then,

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

Q. Which colligative property is more useful to determine the molecular weight of the substances like proteins and polymers ?

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