The ratio of the vapour pressure of a solution to the vapour pressure of the solvent is

(a) Equal to the mole fraction of the solvent

(b) Proportional to the mole fraction of the solute

(c) Equal to the mole fraction of the solute

(d) None of the above

Concept Questions :-

Relative Lowering of Vapour Pressure/ Vapour Pressure
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Mole fraction of the component A in vapour phase is X1 and mole fraction of component A in liquid mixture is X2 then 

(PA0 = vapour pressure of pure A; PB0= vapour pressure of pure B),

then total vapour pressure of the liquid mixture is-

(a) PA0X2X1

(b) PA0X1X2

(c) PB0X1X2

(d) PB0X2X1

Concept Questions :-

Relative Lowering of Vapour Pressure/ Vapour Pressure
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pH of a 0.1 (M) mono basic is found to be 2. Hence osmotic pressure at given temperature T is-

1. 0.1 RT

2. 0.11RT

3. 1.1RT

4. 0.01RT

Concept Questions :-

Osmosis and Osmotic Pressure
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The vapour pressure of pure water at 298K is 23.76mm. The vapour pressure of a solution of sucrose(C12H22O11) in 5.56 moles of water is 23.392mm Hg. The mass of sucrose in the solution is

(a) 15 g

(b) 45 g

(c) 30 g

(d) 37.5 g

Concept Questions :-

Relative Lowering of Vapour Pressure/ Vapour Pressure
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Which of the following 0.1 M aqueous solutions  will have the lowest freezing point ?

(a) Potassium Sulphate

(b) Sodium chloride

(c) Urea

(d) Glucose

Concept Questions :-

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A 100.0g ice cube at 0.0°C is placed in 650g of water at 25°C . what is the final temperature of the mixture?

1. 11°C

2. 12.5°C

3. 18°C

4. 16°C

Concept Questions :-

Please attempt this question first.

Difficulty Level:


The vapour pressure of toluene is 59.1 torr at 313.75 K and 298.7 torr at 353.15 K. Calculate, the molar heat of vaporisation.

1. 37888 J mol-1

2. 27188 J mol-1

3.  12834 J mol-1

4. 571328 J mol-1

Concept Questions :-

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The vapour pressure of pure liquid solvent A is 0.80 atm.

When a non-volitile substance B is added to the solvent, its vapour pressure drops to 0.60 atm. mole fraction of the somponent B in the solution is-

(a) 0.50

(b) 0.75

(c) 0.40

(d) 0.25

Concept Questions :-

Relative Lowering of Vapour Pressure/ Vapour Pressure
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Which of the following 0.1 (M) aqueous solution will have lowest boiling point ?

(a) K2SO4

(b) NaCl

(c) Urea

(d) Glucose

Concept Questions :-

Elevation of Boiling Point
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The boiling point of acetic acid is 118.1°C and its latent heat of vaporisation is 121 cal/gm. A solution containing 0.4344 gm anthracene in 44.16 gm acetic acid boils at 118.24°C. What is the molecular wt. of anthracene ?

(a) 122

(b) 178

(c) 105

(d) 154

 

Concept Questions :-

Elevation of Boiling Point
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Difficulty Level: