Lowering in vapour pressure is the highest for:

1. 0.2 m urea

2. 0.1 m glucose

3. 0.1 m MgSO4

4. 0.1 m BaCl2

Subtopic:  Relative Lowering of Vapour Pressure |
 71%
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The Vapour pressure of CCl4 at 25°C is 143 mm Hg. 0.5 g of a non-volatile solute (mol. wt. 65) is dissolved in 100 ml of CCl4. The vapor pressure of the solution is-

(Density of CCl= 1 .58 g/cm3) 

1. 141.93 mm Hg

2. 94.39 mm Hg

3. 199.34 mm Hg

4. 143.99 mm Hg

Subtopic:  Relative Lowering of Vapour Pressure |
 68%
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The vapour pressure of pure benzene and toluene are 160 and 60 torr respectively. The mole fraction of toluene in vapour phase in contact with an equimolar solution of benzene and toluene is -

1. 0.50 2. 0.6
3. 0.27 4. 0.73
Subtopic:  Dalton’s Law of Partial Pressure |
 60%
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The vapour pressure of a solvent decreases by 10 mm of mercury when a non-volatile solute was added to the solvent. The mole fraction of the solute in the solution is 0.2. What should be if the decrease in vapour pressure is to be 20 mm of mercury then the mole fraction of the solvent is [CBSE PMT 1998]

(1) 0.8

(2) 0.6

(3) 0.4

(4) None

Subtopic:  Concentration Terms & Henry's Law |
 53%
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Osmotic pressure is 0.0821 atm at a temperature of 300 K. Find concentration in mole/litre [Roorkee 1990]

(1) 0.033

(2) 0.066

(3) 0.33 × 10–2

(4) 3

Subtopic:  Osmosis & Osmotic Pressure |
 85%
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The osmotic pressure of 5 % (mass-volume) solution of cane sugar at 150 °C (mol. mass of sugar = 342 g/mole) is:

1. 4 atm 2. 5.07 atm
3. 3.55 atm 4. 2.45 atm
Subtopic:  Osmosis & Osmotic Pressure |
 79%
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A solution containing 3.3 g of a substance in 125 g of benzene (b.p. 80°C) boils at 80.66°C. If Kb for one litre of benzene is 3.28°C, the molecular weight of the substance shall be 

1. 127.20

2. 131.20

3. 137.12

4. 142.72

Subtopic:  Elevation of Boiling Point |
 76%
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The molal b.p. constant for water is 0.513oCkgmol1. When 0.1 mole of sugar is dissolved in 200 g of water, the solution boils under a pressure of 1 atm at

(1) 100.513°C

(2) 100.0513°C

(3) 100.256°C

(4) 101.025°C

Subtopic:  Elevation of Boiling Point |
 77%
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An aqueous solution containing 1 g of urea boils at 100.25 °C. The aqueous solution containing 3 g of glucose in the same volume will boil at:
1. 100.75 °C
2. 100.5 °C
3. 100 °C
4. 100.25 °C

Subtopic:  Osmosis & Osmotic Pressure |
 73%
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Solution of sucrose (Mol. Mass = 342) is prepared by dissolving 34.2 gm of it in 1000 gm of water. Freezing point of the solution is (Kf for water is 1.86 K kg mol–1) [AIEEE 2003]

(1) 272.814 K

(2) 278.1 K

(3) 273.15 K

(4) 270 K

Subtopic:  Depression of Freezing Point |
 76%
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