# The ratio of the vapour pressure of a solution to the vapour pressure of the solvent is 1. Equal to the mole fraction of the solvent 2. Proportional to the mole fraction of the solute 3. Equal to the mole fraction of the solute 4. None of the above

Subtopic:  Relative Lowering of 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

(${\mathrm{P}}_{\mathrm{A}}^{0}$ = vapour pressure of pure A; ${\mathrm{P}}_{\mathrm{B}}^{0}$= vapour pressure of pure B),

then total vapour pressure of the liquid mixture is-

1. $\frac{{\mathrm{P}}_{\mathrm{A}}^{0}{\mathrm{X}}_{2}}{{\mathrm{X}}_{1}}$

2. $\frac{{\mathrm{P}}_{\mathrm{A}}^{0}{\mathrm{X}}_{1}}{{\mathrm{X}}_{2}}$

3. $\frac{{\mathrm{P}}_{\mathrm{B}}^{0}{\mathrm{X}}_{1}}{{\mathrm{X}}_{2}}$

4. $\frac{{\mathrm{P}}_{\mathrm{B}}^{0}{\mathrm{X}}_{2}}{{\mathrm{X}}_{1}}$

Subtopic:  Relative Lowering of Vapour Pressure |
58%
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pH of a 0.1 (M) monobasic acid is 2. Osmotic pressure at a given temperature T is-

1. 0.1RT

2. 0.11RT

3. 1.1RT

4. 0.01RT

Subtopic:  Osmosis & 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

1. 15 g

2. 45 g

3. 30 g

4. 37.5 g

Subtopic:  Relative Lowering of Vapour Pressure |
58%
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Among the following options, 0.1 M aqueous solution that will have the lowest freezing point is-

 1 Potassium Sulphate. 2 Sodium chloride. 3 Urea. 4 Glucose.

Subtopic:  Depression of Freezing Point |
67%
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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

Subtopic:  Raoult's Law |
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The vapour pressure of a pure liquid solvent A is 0.80 atm. When a non-volatile substance B is added to the solvent, its vapour pressure drops to 0.60 atm.
Mole fraction of the component B in the solution is:

 1 0.5 2 0.75 3 0.4 4 0.25
Subtopic:  Relative Lowering of Vapour Pressure |
72%
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The lowest boiling point, if concentration is fixed at 0.1 M in aqueous solution, is given by which of the following solutions?

a. K2SO4

b. NaCl

c. Urea

d. Glucose

1. a, b

2. b, c

3. c, d

4. d, a

Subtopic:  Elevation of Boiling Point |
66%
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The boiling point of acetic acid is 118.1$°\mathrm{C}$ 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$°\mathrm{C}$. What is the molecular wt. of anthracene ?

1. 122

2. 178

3. 105

4. 154

Subtopic:  Elevation of Boiling Point |
65%
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Which solution will have the highest boiling point ?

1. 1 (M) C6H12O6 solution

2. 1 (M) NaCl solution

3. 1 (M) BaCl2 solution

4. 1 (M) CO(NH2)2 solution

Subtopic:  Van’t Hoff Factor |
63%
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