The mixture that shows positive deviation from Raoult's law is-

1. Benzene + Toluene

2. Acetone + Chloroform

3. Chloroethane + Bromoethane

4. Ethanol + Acetone

Subtopic:  Raoult's Law |
 67%
From NCERT
NEET - 2020
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Considering the formation, breaking and strength of hydrogen bond, predict which of the following mixtures will show a positive deviation from Raoult’s law?

1.  Methanol and acetone

2.  Chloroform and acetone

3.  Nitric acid and water

4.  Phenol and aniline

 

Subtopic:  Azeotrope |
 71%
From NCERT
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The value of Henry's constant KH:

1. Increases with an increase in temperature.
2. Decreases with an increase in temperature.
3. Remains constant.
​​​​​​
4. First increases then decreases.

Subtopic:  Concentration Terms & Henry's Law |
 63%
From NCERT
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Van't Hoff factor (i) is given by the expression:

a. i= Normal molar mass  abnormal molar mass.

b. i= Abnormal molar mass  normal molar mass. 

c. i= Observed colligative property  calculated colligative property. 

d. i= Calculated colligative property  observed colligative property.

The correct choice among the given options are:

1. (a, b)

2. (b, c)

3. (c, d)

4. (a, c)

Subtopic:  Van’t Hoff Factor |
 66%
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If 8 g of a non-electrolyte solute is dissolved in 114 g of n-octane to reduce its vapor pressure to 80 %, the molar mass (in g mol–1) of the solute is:

[Molar mass of n-octane is 114 g mol–1]

1. 40 2. 60
3. 80 4. 20
Subtopic:  Relative Lowering of Vapour Pressure |
 60%
From NCERT
NEET - 2020
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200 mL of an aqueous solution contains 1.26 g of protein. The osmotic pressure of this solution at 300 K is found to be 2.57 × 10–3 bar. The molar mass of protein will be:

(R = 0.083 L bar mol–1 K–1):

1. 61038 g mol–1  2. 51022 g mol–1
3. 122044 g mol–1  4. 31011 g mol–1
Subtopic:  Osmosis & Osmotic Pressure |
 69%
From NCERT
AIPMT - 2011
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A solution of urea (molar mass 56 g mol–1) boils at 100.18 ºC at atmospheric pressure. If Kf and Kb for water are 1.86 and 0.512 K kg mol–1 respectively, the above solution will freeze at:

1. –6.54 ºC

2. –0.654 ºC

3. 6.54 ºC

4. 0.654 ºC

Subtopic:  Elevation of Boiling Point | Depression of Freezing Point |
 75%
From NCERT
AIPMT - 2005
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The following solutions were prepared by dissolving 10 g of glucose (C6H12O6) in 250 ml of water (P1), 10 g of urea (CH4N2O) in 250 ml of water (P2) and 10 g of sucrose (C12H22O11) in 250 ml of water (P3). The decreasing order of osmotic the pressure of these solutions is:

1. P2 > P3 > P1 2. P3 > P1 > P2
3. P2 > P1 > P3 4. P1 > P2 > P3
Subtopic:  Osmosis & Osmotic Pressure |
 69%
From NCERT
NEET - 2021
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The correct option for the value of vapour pressure of a solution at 45 °C with benzene to octane in a 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]
1. 336 mm of Hg
2. 350 mm of Hg
3. 160 mm of Hg
4. 168 mm of Hg

Subtopic:  Raoult's Law |
 73%
From NCERT
NEET - 2021
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The mole fraction of ethylene glycol (C2H6O2) in a solution containing 20% of C2H6O2 by mass is:

1. 0.932
2. 0.0672

3. 0.832

4. 0.732

Subtopic:  Concentration Terms & Henry's Law |
 71%
From NCERT
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