HARD

Earn 100

A very small amount of non-volatile solute (That does not dissociate) is dissolved in $56.8 c m^{3}$ of benzene $(D e n s i t y = 0.889 g c m^{- 3})$ . At room temperature, vapour pressure of the solution is 98.88 mm Hg while that of benzene is 100 mm Hg. Find the molality of the solution. If the freezing point of the solution is 0.73 degree lower than that of benzene, what is the value of $K_{f}$ for benzene ?

50% studentsanswered this correctly

Important Questions on Solutions

MEDIUM

Chemistry>Physical Chemistry>Solutions>Relative Lowering of Vapour Pressure

Water

+ {CH}_{3} OH

mixture shows positive deviation from ideal solution behaviour

100 mL

of water is mixed with

100 mL

{CH}_{3} OH

. Then, total volume of the mixture will be

HARD

Chemistry>Physical Chemistry>Solutions>Relative Lowering of Vapour Pressure

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

35^{o} C

is (are)

HARD

Chemistry>Physical Chemistry>Solutions>Relative Lowering of Vapour Pressure

Benzene and toluene form an ideal solution over the entire range of composition. The vapour pressure of pure benzene and toluene at $T (K)$ are $50 mmHg$ and $40 mmHg$ , respectively. What is the mole fraction of toluene in vapour phase when $117 g$ of benzene is mixed with $46 g$ of toluene?

(Molar mass of benzene and toluene are $78$ and $92 g {mol}^{- 1}$ , respectively)

MEDIUM

Chemistry>Physical Chemistry>Solutions>Relative Lowering of Vapour Pressure

The solution which will freeze at the lowest temperature is

MEDIUM

Chemistry>Physical Chemistry>Solutions>Relative Lowering of Vapour Pressure

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

EASY

Chemistry>Physical Chemistry>Solutions>Relative Lowering of Vapour Pressure

A mixture of toluene and benzene forms a nearly ideal solution. Assume

P_{B} °

and

P_{T} °

to be the vapor pressures of pure benzene and toluene, respectively. The slope of the line obtained by plotting the total vapor pressure to the mole fraction of benzene is:

MEDIUM

Chemistry>Physical Chemistry>Solutions>Relative Lowering of Vapour Pressure

A solution contains

5

moles of

X

and

5

moles of

Y

, and has a normal boiling point of

90 ° C

. The vapor pressure of pure

X

300 mm Hg

. What is the vapor pressure of pure

Y

at this temperature?

EASY

Chemistry>Physical Chemistry>Solutions>Relative Lowering of Vapour Pressure

The vapour pressure of pure liquids

A

and

B

are

450

and

700 mm

Hg

350 K

respectively. If the total vapour pressure of the mixture is

600 mm

Hg,

the composition of the mixture in the solution is

EASY

Chemistry>Physical Chemistry>Solutions>Relative Lowering of Vapour Pressure

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

MEDIUM

Chemistry>Physical Chemistry>Solutions>Relative Lowering of Vapour Pressure

Which of the following mixtures shows negative deviation from Raoult's law?

EASY

Chemistry>Physical Chemistry>Solutions>Relative Lowering of Vapour Pressure

The colligative properties of a dilute solution depend upon

MEDIUM

Chemistry>Physical Chemistry>Solutions>Relative Lowering of Vapour Pressure

The mixture that forms maximum boiling azeotrope is

EASY

Chemistry>Physical Chemistry>Solutions>Relative Lowering of Vapour Pressure

On mixing

20 mL

of acetone with

60 mL

of chloroform, the total volume of the solution is

EASY

Chemistry>Physical Chemistry>Solutions>Relative Lowering of Vapour Pressure

A pressure cooker reduces cooking time for food because

MEDIUM

Chemistry>Physical Chemistry>Solutions>Relative Lowering of Vapour Pressure

Which of the following conditions is satisfied by a non-ideal solution?

EASY

Chemistry>Physical Chemistry>Solutions>Relative Lowering of Vapour Pressure

The correct option for the value of vapour pressure of a solution at $45 º C$ with benzene to octane in molar ratio $3 : 2$ is:

[At $45 ° C$ vapour pressure of benzene is $280 mm Hg$ and that of octane is $420 mm Hg .$ Assume Ideal gas]

HARD

Chemistry>Physical Chemistry>Solutions>Relative Lowering of Vapour Pressure

298 K

, the vapour pressure of an ideal solution containing

1 mol

of liquid

L 1

and

2 mol

of liquid

L 2

500 mm

Hg. When

2 mol

L 1

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

5 %

. What are the respective vapour pressures (in mm

Hg

) of

L 1

and

L 2

in their pure states at

298 K

MEDIUM

Chemistry>Physical Chemistry>Solutions>Relative Lowering of Vapour Pressure

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

1

molal aqueous

KI

solution at same temperature?

MEDIUM

Chemistry>Physical Chemistry>Solutions>Relative Lowering of Vapour Pressure

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

MEDIUM

Chemistry>Physical Chemistry>Solutions>Relative Lowering of Vapour Pressure

For an ideal solution, the correct option is:

Important Questions on Solutions

Learn and Prepare for any exam you want !