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A person living in Shimla observed that cooking food without using pressure cooker takes more time. The reason is that at high altitude $________$

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Important Questions on Solutions

EASY

Chemistry>Physical Chemistry>Solutions>Vapour Pressure of Liquid Solutions

The elevation of boiling point of

0.10 m

aqueous

{CrCl}_{3} . {xNH}_{3}

solution is two times that of

0.05 m

aqueous

{CaCl}_{2}

solution. The value of

x

\dots \dots \dots \dots . .

[Assume

100 %

ionisation of the complex and

{CaCl}_{2},

coordination number of

Cr

6,

and that all

{NH}_{3}

molecules are present inside the coordination sphere]

MEDIUM

Chemistry>Physical Chemistry>Solutions>Vapour Pressure of Liquid Solutions

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?

EASY

Chemistry>Physical Chemistry>Solutions>Vapour Pressure of Liquid Solutions

1 g

of a non-volatile non-electrolyte solute is dissolved in

100 g

of two different solvents

A

and B whose ebullioscopic constants are in the ratio of

1 : 5

. The ratio of the elevation in their boiling points,

\frac{∆ T_{b} (A)}{∆ T_{b} (B)}

, is: (assuming they have the same molar mass)

MEDIUM

Chemistry>Physical Chemistry>Solutions>Vapour Pressure of Liquid Solutions

Solute

' X'

dimerises in water to the extent of

80 %

2.5 g

' X'

100 g

of water increases the boiling point by

0.3 ° C

. The molar mass of

' X'

[K_{b} = 0.52 K {kgmol}^{- 1}]

MEDIUM

Chemistry>Physical Chemistry>Solutions>Vapour Pressure of Liquid Solutions

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}

]

MEDIUM

Chemistry>Physical Chemistry>Solutions>Vapour Pressure of Liquid Solutions

An aqueous solution freezes at

272.4 K

, while pure water freezes at

273 K

, given

K_{f} = 1.86 K kg {mol}^{- 1}

, and

K_{b} = 0.512 K kg {mol}^{- 1};

the molality of solution and boiling point of solution respectively will be -

EASY

Chemistry>Physical Chemistry>Solutions>Vapour Pressure of Liquid Solutions

1 m o l

N a C l

solute is dissolved in

1 k g

of water, at what temperature will water boil at

1.013

bar?

(K_{b} o f w a t e r i s 0.52 K k g m o l^{- 1})

EASY

Chemistry>Physical Chemistry>Solutions>Vapour Pressure of Liquid Solutions

The boiling point (in

{}^{\circ}C

) of

0.1

molal aqueous solution of

{CuSO}_{4} . 5 H_{2} O

1

bar is closest to: [Given: Ebullioscopic (molal boiling point elevation) constant of water,

K_{b} = 0.512 K {kgmol}^{- 1}]

EASY

Chemistry>Physical Chemistry>Solutions>Vapour Pressure of Liquid Solutions

Identify which liquid will have a higher vapour pressure at

90 ℃

if the boiling points of two liquids

A

and

B

are

140 ℃

and

180 ° C

, respectively.

MEDIUM

Chemistry>Physical Chemistry>Solutions>Vapour Pressure of Liquid Solutions

The vapour pressure vs. temperature curve for a solution solvent system is shown below.

Question Image

The boiling point of the solvent is _____°C.

MEDIUM

Chemistry>Physical Chemistry>Solutions>Vapour Pressure of Liquid Solutions

180 g

of glucose,

C_{6} H_{12} O_{6}

is dissolved in

1 kg

of water in a saucepan. At what temperature the solution will boil at

1.013

bar?

(K_{b}

for water is

0.52 K kg {mol}^{- 1})

EASY

Chemistry>Physical Chemistry>Solutions>Vapour Pressure of Liquid Solutions

A pressure cooker reduces cooking time for food because

MEDIUM

Chemistry>Physical Chemistry>Solutions>Vapour Pressure of Liquid Solutions

The elevation in the boiling point of an aqueous solution of

NaCl

0.01 ° C

. If its van't Hoff factor is

1.92,

the molality of

NaCl

solution is ___

(K_{b}

for water

= 0.52 K kg {mol}^{- 1})

HARD

Chemistry>Physical Chemistry>Solutions>Vapour Pressure of Liquid Solutions

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

EASY

Chemistry>Physical Chemistry>Solutions>Vapour Pressure of Liquid Solutions

The boiling point of

0.001 M

aqueous solutions of

NaCl, {Na}_{2} {SO}_{4}, K_{3} {PO}_{4}

and

{CH}_{3} COOH

should follows the order.

MEDIUM

Chemistry>Physical Chemistry>Solutions>Vapour Pressure of Liquid Solutions

1

molal aqueous solution of an electrolyte

A_{2} B_{3}

60 %

ionised. The boiling point of the solution at

1 atm

is _____

K

. (Rounded-off to the nearest integer) [Given

K_{b}

for

(H_{2} O) = 0.52 K kg {mol}^{- 1}

]

HARD

Chemistry>Physical Chemistry>Solutions>Vapour Pressure of Liquid Solutions

If a compound

AB

dissociates to the extent of

75 %

in an aqueous solution, the molality of the solution which shows a

2.5 K

rise in the boiling point of the solution is ___ molal. (Rounded-off to the nearest integer)

[K_{b} = 0.52 K kg {mol}^{- 1}]

MEDIUM

Chemistry>Physical Chemistry>Solutions>Vapour Pressure of Liquid Solutions

The boiling point of

0.2 m o l k g^{- 1}

solution of X in water is greater than equimolal solution of Y in water. Which one of the following statements is true in this case?

EASY

Chemistry>Physical Chemistry>Solutions>Vapour Pressure of Liquid Solutions

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)

MEDIUM

Chemistry>Physical Chemistry>Solutions>Vapour Pressure of Liquid Solutions

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

1

molal aqueous

KI

solution at same temperature?

A person living in Shimla observed that cooking food without using pressure cooker takes more time. The reason is that at high altitude ________

Important Questions on Solutions

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A person living in Shimla observed that cooking food without using pressure cooker takes more time. The reason is that at high altitude $________$