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Standard XII
Chemistry
Crystalline and Amorphous Solid
Why is the mo...
Question

Why is the molecular mass determined by measuring the colligative property in case of some solutes is abnormal?

A
Due to association or dissociation of solute molecules
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B
Due to insolubility of solute molecules
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C
Due to decomposition of solute molecules
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D
Due to large size of solute molecules
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Solution

The correct option is A Due to association or dissociation of solute molecules
Due to association or dissociation of solute molecules there is a change in number of particles. Since colligative properties depend on number of particles there is a change in molecular mass.

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Q. Match the following.
Column - IColumn - II
a) When the molecular state of solute in solution is unchangedp) The observed colligative property is normal.
b) When the solute undergoes association in solution .q) inversely proportional to the molecular mass of the solute
c) When the solute undergoes dissociation is solution.r) The observed colligative property is larger in magnitude.
d) A colligative property s) The observed colligative property is smaller in magnitude

Q.

Why is the mass determined by measuring a colligative property in case of some solutes abnormal? Discuss it with the help of van't Hoff factor.

Q. MwN= Normal molecular mass of solute
Mw2=Observed molecular mass of solute from colligative property measurement.
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 etc. in H2O.
(ii) Association of solute: It decreases the colligative properties.
e.g.: Dimerisation of acetic acid in benzene.

If the degree of dissociation of an electrolyte A2B3 is 25% in a solvent, then:
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 etc. in H2O.
(ii) Association of solute: It decreases the colligative properties.
e.g.: Dimerisation of acetic acid in benzene.

Four different 100ml solutions are prepared by mixing 1 gram each of NaCl,(NH2)2CO,Na2SO4 and K4[Fe(CN)6] at a temperature T. Correct order of osmotic pressure is:
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