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The aqueous solution that has the lowest vapour pressure at a given temperature is:

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Important Questions on Solutions

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Chemistry>Physical Chemistry>Solutions>Colligative Properties

Consider the following liquid - vapour equilibrium.

L i q u i d ⇌ V a p o u r

Which of the following relations is correct?

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Chemistry>Physical Chemistry>Solutions>Colligative Properties

A solution at

20^{o} C

is composed of 1.5 mol of benzene and 3.5 mol of toluene. If the vapour pressure of pure benzene and pure toluene at this temperature are 74.7 torr and 22.3 torr respectively, then the total vapour pressure of the solution and the benzene mole fraction in equilibrium with it will be, respectively:

EASY

Chemistry>Physical Chemistry>Solutions>Colligative Properties

Which one of the following is incorrect for ideal solution?

HARD

Chemistry>Physical Chemistry>Solutions>Colligative Properties

Choose the correct statement with respect to the vapour pressure of a liquid among the following :

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Chemistry>Physical Chemistry>Solutions>Colligative Properties

A solution is prepared by mixing

40 g

{CHCl}_{3}

with

17 g

{CH}_{2} {Cl}_{2}

298 K

and

281 mmHg

pressure. Assuming validity of Roult's law, the vapour pressure of pure

{CH}_{2} {Cl}_{2}

(in

mmHg

) at

298 K

is [Vapour pressure of pure

{CHCl}_{3}

298 K = 200 mmHg

; molar mass of

{CHCl}_{3} = 120 g {mol}^{- 1}

; molar mass of

{CH}_{2} {Cl}_{2} = 85 g {mol}^{- 1}

]

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Chemistry>Physical Chemistry>Solutions>Colligative Properties

The vapour pressures of pure liquids

A

and

B

are

400

and

600 mm Hg

respectively at

298 K .

On mixing the two liquids, the sum of their volumes is equal to the volume of the final mixture. The mole fraction of liquid

B

0.5

in the mixture. The vapour pressure of the final solution, the mole fractions of components

A

and

B

in the vapour phase, respectively are

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Chemistry>Physical Chemistry>Solutions>Colligative Properties

Which one is not equal to zero for an ideal solution?

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Chemistry>Physical Chemistry>Solutions>Colligative Properties

300 K

, the vapour pressure of a solution containing

1

mole of

n

-hexane and

3

moles of

n

-heptane is

550 mm

Hg

. At the same temperature, if one more mole of

n

-heptane is added to this solution, the vapour pressure of the solution increases by

10 mm

Hg

. What is the vapour pressure in

mmHg

n

- heptane in its pure state______?

HARD

Chemistry>Physical Chemistry>Solutions>Colligative Properties

Mixture(s) showing positive deviation from Raoult's law at

35^{o} C

is (are)

HARD

Chemistry>Physical Chemistry>Solutions>Colligative Properties

Which of the following statements about the composition of the vapour over an ideal 1 : 1 molar mixture of benzene and toluene is correct? Assume that the temperature is constant at

25^{o} C

. (Given vapour pressure data at

25^{o} C

, benzene = 12.8 kPa, toluene = 3.85 kPa)

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Chemistry>Physical Chemistry>Solutions>Colligative Properties

For an ideal solution, the correct option is:

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Chemistry>Physical Chemistry>Solutions>Colligative Properties

A pressure cooker reduces cooking time for food because

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Chemistry>Physical Chemistry>Solutions>Colligative Properties

The mixture that forms maximum boiling azeotrope is

EASY

Chemistry>Physical Chemistry>Solutions>Colligative Properties

For an ideal solution of two components

A & B

, which of the following is true?

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Chemistry>Physical Chemistry>Solutions>Colligative Properties

Solution

A

contains acetone dissolved in chloroform and solution

B

contains acetone dissolved in carbon disulphide. The type of deviations from Raoult’s law shown by solutions

A

and

B

, respectively are

HARD

Chemistry>Physical Chemistry>Solutions>Colligative Properties

Liquids

A

and

B

form ideal solution for all compositions of

A

and

B

25^{\circ} C

. Two such solutions with

0.25

and

0.50

mole fractions of

A

have the total vapor pressures of

0.3

and

0.4

bar, respectively. What is the vapor pressure of pure liquid

B

in bar?

EASY

Chemistry>Physical Chemistry>Solutions>Colligative Properties

The mixture which shows positive deviation from Raoult’s law is

HARD

Chemistry>Physical Chemistry>Solutions>Colligative Properties

Liquids

A

and

B

form an ideal solution in the entire composition range. At

350 K,

the vapour pressure of pure A and pure B are

7 \times 10^{3} Pa

and

12 \times 10^{3} Pa

, respectively. The composition of the vapour in equilibrium with a solution containing 40 mole percent of A at this temperature is:

EASY

Chemistry>Physical Chemistry>Solutions>Colligative Properties

The vapour pressures of

A

and

B

25 ° C

are

90 mmHg

and

15 mm Hg

respectively. If

A

and

B

are mixed such that the mole fraction of

A

in the mixture is

0.6,

then the mole fraction of

B

in the vapour phase is

x \times 10^{- 1} .

The value of

x

is (Nearest integer)

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Chemistry>Physical Chemistry>Solutions>Colligative Properties

Which of the following changes will cause increase in vapour pressure of

1

molal aqueous

KI

solution at same temperature?

The aqueous solution that has the lowest vapour pressure at a given temperature is:

Important Questions on Solutions

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