When 0.1 m CH3COOH is present in a solvent it shows elevation in boiling point of 0.75°C. Acid dissociation constant will be -(Kb=5 K Kg mol-1) (1M =1m)

(1) 5 X 10-2

(2) 5 X 10-3

(3) 10-2

(4) 10-3 

Subtopic:  Van’t Hoff Factor |
 62%
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Which of the following shows positive deviation from Raoult's law:

(i) Chloroform and acetone

(ii) Carbon disulphide and acetone

(iii) Ethanol and Acetone

(iv) Phenol and Aniline

(1) i and ii

(2) ii and iii

(3) i and iv

(4) ii and iv

Subtopic:  Raoult's Law |
 71%
From NCERT
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A non-volatile solute is dissolved in water. If its degree of association is 50%. What will be its freezing point when the boiling point is 100.52°C. [Kb=0.52 K kg mol-1, Kf=1.86K kg mol-1]

1. -0.52 K

2. -0.52°C

3. -1.86°C

4. 275.01 K

Subtopic:  Depression of Freezing Point |
 73%
From NCERT
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When 36 g of a solute having the emperical formula CH2O is dissolved in 1.2 kg of water, the solution freezes at -0.93°C. What is the molecular formula of solute (Kf=1.86 kg K mol-1)

(1) C2H4O

(2) C2H2O2

(3) C2H4O3

(4) C2H4O2

Subtopic:  Depression of Freezing Point |
 80%
From NCERT
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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 |
From NCERT
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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%
From NCERT
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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%
From NCERT
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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%
From NCERT
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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%
From NCERT
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