If partial pressure of oxygen is 0.5 atm and K= 1.4 × 10-3 M/atm, then the amount of oxygen dissolved in 100 ml water at 298K is-

1. 22.4 mg 2. 22.4 g
3. 2.24 g 4. 2.24 mg

Subtopic:  Dalton’s Law of Partial Pressure |
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A solute x when dissolved in solvent associates to form a pentamer. The value of van't hoff factor (i) for the solute will be:-

1. 0.5

2. 5

3. 0.2

4. 0.1

 

Subtopic:  Van’t Hoff Factor |
 64%
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What amount of CaCl2(i=2.47) is dissolved in 2L water so that its osmotic pressure is 0.5 atm at 27°C:-

(1) 13.42 g

(2) 19.24 g

(3) 8.834 g

(4) 1.820 g

Subtopic:  Osmosis & Osmotic Pressure |
 67%
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One litre aqueous solution of sucrose (molar mass = 342 g/mol) weighing 1015 g is found to record an osmotic pressure of 4.8 atm at 293K. What is the molality of the sucrose solution ? (R= 0.0821 L atm K-1 mol-1) :

(1) 0.84

(2) 0.21

(3) 0.42

(4) 0.63

Subtopic:  Osmosis & Osmotic Pressure |
 74%
From NCERT
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The total vapor of a solution of liquid A and liquid B is 600 torr. The mole fraction of component A in the liquid phase is 0.7 and in the vapor phase is 0.35. The vapor pressure of pure A and B are respectively

(1) 300 torr, 130 torr

(2) 1300 torr, 130 torr

(3) 300 torr, 1300 torr

(4) 300 torr, 300 torr

Subtopic:  Dalton’s Law of Partial Pressure |
 62%
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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

 

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%
From NCERT
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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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