EASY

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The aqueous solution that shows the maximum boiling point elevation is [Assume identical conditions]

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Important Questions on Solutions

MEDIUM

Chemistry>Physical Chemistry>Solutions>Elevation of Boiling Point

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?

MEDIUM

Chemistry>Physical Chemistry>Solutions>Elevation of Boiling Point

The boiling point of water is

100 ° C

. Calculate the boiling point of an aqueous solution containing

5 g

urea

(Molar mass = 60)

100 g

of water.

(K_{b} = 0.52 K Kg {mol}^{- 1})

MEDIUM

Chemistry>Physical Chemistry>Solutions>Elevation of Boiling Point

Boiling point of a

2 %

aqueous solution of a nonvolatile solute

A

is equal to the boiling point of

8 %

aqueous solution of a non-volatile solute

B

. The relation between molecular weights of

A

and

B

is.

EASY

Chemistry>Physical Chemistry>Solutions>Elevation of Boiling Point

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})

MEDIUM

Chemistry>Physical Chemistry>Solutions>Elevation of Boiling Point

1.8 g

of glucose

(C_{6} H_{12} 0_{6})

dissolved in

100 g

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

1.013 bar

? Given the boiling point of the water at

1.013 bar

373.15 K

and

K_{b}

for water is

0.52 K Kg {mol}^{-}

HARD

Chemistry>Physical Chemistry>Solutions>Elevation of Boiling Point

The plot given below shows $P - T$ curves (where, $P$ is the pressure and $T$ is the temperature) for two solvents $X$ and $Y$ and isomolal solutions of $NaCl$ in these solvents. $NaCl$ completely dissociates in both the solvents.

Question Image

On the addition of equal number of moles of a non-volatile solute $S$ in equal amount (in $kg$ ) of these solvents, the elevation of boiling point of solvent $X$ is three times that of solvent $Y$ . The solute $S$ is known to undergo dimerization in these solvents. If the degree of dimerization is $0.7$ in the solvent $Y$ , the degree of dimerization in the solvent $X$ is _______.

EASY

Chemistry>Physical Chemistry>Solutions>Elevation of Boiling Point

The elevation in boiling point for

1

molal solution of non-volatile solute

A

3 K

. The depression in freezing point for

2

molal solution of

A

in the same solvent is

6 K

. The ratio of

K_{b}

and

K_{f}

i.e.,

K_{b} / K_{f}

1 : X

. The value of

X

MEDIUM

Chemistry>Physical Chemistry>Solutions>Elevation of Boiling Point

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}]

EASY

Chemistry>Physical Chemistry>Solutions>Elevation of Boiling Point

For cooking pulses, generally salt is added in the beginning. Give reason.

HARD

Chemistry>Physical Chemistry>Solutions>Elevation of Boiling Point

Calculate the boiling point of urea solution when

6 g

of urea is dissolved in

200 g

of water. (

K_{b}

for water

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

, boiling point of pure water

= 373 K

, molecular weight of urea

= 60

EASY

Chemistry>Physical Chemistry>Solutions>Elevation of Boiling Point

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)

EASY

Chemistry>Physical Chemistry>Solutions>Elevation of Boiling Point

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.

EASY

Chemistry>Physical Chemistry>Solutions>Elevation of Boiling Point

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]

EASY

Chemistry>Physical Chemistry>Solutions>Elevation of Boiling Point

The rise in boiling point of a solution containing

1.8 g

of glucose in

100 g

of solvent is

0.1 ° C

. The molal elevation constant of the liquid is

MEDIUM

Chemistry>Physical Chemistry>Solutions>Elevation of Boiling Point

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 -

MEDIUM

Chemistry>Physical Chemistry>Solutions>Elevation of Boiling Point

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})

MEDIUM

Chemistry>Physical Chemistry>Solutions>Elevation of Boiling Point

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})

MEDIUM

Chemistry>Physical Chemistry>Solutions>Elevation of Boiling Point

What do you mean by elevation in boiling point? Explain with the help of a graph.

EASY

Chemistry>Physical Chemistry>Solutions>Elevation of Boiling Point

An aqueous solution of urea freezes at

- 0 . 186^{o} C

K_{f}

for water

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

K_{b}

for water

= 0.512 K kg {mol}^{- 1}

. The boiling point of urea solution will be:

EASY

Chemistry>Physical Chemistry>Solutions>Elevation of Boiling Point

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}]

The aqueous solution that shows the maximum boiling point elevation is [Assume identical conditions]

Important Questions on Solutions

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