The Van't Haff factor of a 0.005 M aqueous solution of KCl is 1.95. The degree of ionisation of KCl is:

(1) 0.95

(2) 0.97

(3) 0.94

(4) 0.96

Concept Questions :-

Van’t Hoff Factor
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The solution having highest vapour pressure is (Assume 100% ionisation of electrolytes)

(1) 1 N KNO3

(2) 1 N Ba(NO3)2

(3) 1 N Al2(SO4)3

(4) 1 N Th(NO3)4

 

Concept Questions :-

Relative Lowering of Vapour Pressure/ Vapour Pressure
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K4[Fe(CN)6] is 60% ionised. Then the value of Van't Hoff factor is

1. 1.6

2. 2.4

3. 3

4. 3.4

Concept Questions :-

Van’t Hoff Factor
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Compound PdCl4.6H2O is a hydrated complex, 1 molal aqueous solution of it has freezing point 269.28K. Assuming 100% ionization of complex, calculate the molecular formula of the complex

(Kt for water = 1.86 K kg mole-1)

1. [Pd(H2O)6]Cl4

2. [Pd(H2O)4Cl2]Cl2.2H2O

3. [Pd(H2O)3Cl3]Cl.3H2O

4. [Pd(H2O)Cl4]4H2O

Concept Questions :-

Depression of Freezing Point
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The vapour pressure of water at room temperature is 30 mm of Hg. If the mole fraction of the water is 0.9, the vapour pressure of solution will be

(1) 30 mm of Hg

(2) 24 mm of HG

(3) 21 mm of Hg

(4) 27 mm of Hg

 

Concept Questions :-

Dalton’s Law of Partial Pressure/ Henry"s law
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If molality of the dilute solution is doubled, the value of molal depression constant (Kf) will be?

(a) doubled
(b) halved
(c) tripled
(d) unchanged

Concept Questions :-

Depression of Freezing Point
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Which of the following is dependent on temperature?

(a) Molality
(b) Molarity
(c) Mole fraction
(d) Weight percentage

Concept Questions :-

Concentration Term and Numericals
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The van't Hoff factor [i] for a dilute aqueous solution of the strong electrolyte barium hydroxide is?

(a) 0
(b) 1
(c) 2
(d) 3

Concept Questions :-

Van’t Hoff Factor
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Which one of the following is incorrect for ideal solution ?

(a) Hmix=0

(b) Umix=0

(c) P=Pobs-Pcalculated by Raoul's law = 0

(d) Gmix=0

Concept Questions :-

Introduction/ Colligative properties
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At 100°C the vapour pressure of a solution of 6.5 g of a solute in 100 g water is 732 mm. If Kb = 0.52, the boiling point of this solution will be

(a) 100°C

(b) 102°C

(c) 103°C

(d) 101°C

Concept Questions :-

Elevation of Boiling Point
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