# 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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Van't Hoff factor (i) is given by the expression:

a.

b.

c.

d.

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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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 |
64%
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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 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%
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If N2 gas is bubbled through water at 293 K, how many millimoles of N2 gas would dissolve in 1 litre of water?
(
Partial pressure of nitrogen = 0.987 bar, Henry’s law constant for N2 at 293 K = 76.48 kbar).

1. 0.716 mmol

2. 0.616 mmol

3. 0.726 mmol

4. 0.516 mmol

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