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

 

Subtopic:  Dalton’s Law of Partial Pressure |
 77%
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The van't Hoff 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

Subtopic:  Van’t Hoff Factor |
 83%
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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

 

Subtopic:  Relative Lowering of Vapour Pressure |
 60%
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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

Subtopic:  Van’t Hoff Factor |
 70%
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Compound PdCl4.6H2O is a hydrated complex, 1 molal aqueous solution of it has freezing point 269.28 K. Assuming 100 % ionization of complex, the molecular formula of the complex is-

(Kf 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

Subtopic:  Depression of Freezing Point |
 57%
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In a cold climate frozen causing damage to radiator of a car. Ethylene glycol is used as antifreezing agent. The amount of ethylene glycol to be added to 4 kg of water to prevent it from freezing at -6°C[kf for water=1.85 k kg mol-1]

1. 204.22 g

2. 804.32 g

3. 602 gm

4. 401 gm

Subtopic:  Depression of Freezing Point |
 70%
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If molality of the dilute solution is doubled, the value of molal depression constant (Kf) will be?

(1) doubled

(2) halved

(3) tripled

(4) unchanged

Subtopic:  Depression of Freezing Point |
 61%
From NCERT
NEET - 2017
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The temperature dependent term among the following is -

1. Molality 2. Molarity
3. Mole fraction 4. Weight percentage
Subtopic:  Concentration Terms & Henry's Law |
 83%
From NCERT
NEET - 2017
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The van't Hoff factor [i] for a dilute aqueous solution of the strong electrolyte barium hydroxide is?

(1) 0

(2) 1

(3) 2

(4) 3

Subtopic:  Van’t Hoff Factor |
 61%
From NCERT
NEET - 2016
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Which one of the following is incorrect for ideal solution ?

(1) Hmix=0

(2) Umix=0

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

(4) Gmix=0

Subtopic:  Introduction & Colligative properties |
 70%
From NCERT
NEET - 2016
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