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Q. No.
Given below are two statements: one is labeled as Assertion (A) and the other is labeled as Reason (R): 
Assertion (A): Helium is used to dilute oxygen in the diving apparatus. 
Reason (R): Helium has a high solubility in O2.
In light of the above statements, choose the correct answer from the options given below:
1. (A) is False but (R) is True.
2. Both (A) and (R) are True and (R) is the correct explanation of (A). 
3. Both (A) and (R) are True and (R) is not the correct explanation of (A).
4. (A) is True but (R) is False.
Subtopic:  Concentration Terms & Henry's Law |
 51%
Level 3: 35%-60%
NEET - 2023
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For an ideal solution, the non-zero value will be for:

1. \(\Delta H_\text{mix}\)
2. \(\Delta S_\text{mix}\)
3. \(\Delta V_\text{mix}\)
4. \(\Delta P\)
Subtopic:  Introduction & Colligative properties |
 84%
Level 1: 80%+
NEET - 2015
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Colligative properties are dependent on which of the following factors?

1. The nature of the solute particles dissolved in the solution.
2. The number of solute particles in the solution.
3. The physical properties of the solute particles dissolved in the solution.
4. The nature of solvent particles.
Subtopic:  Introduction & Colligative properties |
 80%
Level 1: 80%+
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The boiling point of 0.2 mol kg–1 solution of X in water is greater than the equimolal solution of Y in water. The correct statement in this case is:

1. X is undergoing dissociation in water.
2. Molecular mass of X is greater than the molecular mass of Y.
3. Molecular mass of X is less than the molecular mass of Y.
4. Y is undergoing dissociation in water while X undergoes no change.
Subtopic:  Elevation of Boiling Point |
 60%
Level 2: 60%+
NEET - 2015
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A solution containing 10 g/dm3 of urea (molecular mass = 60 g mol-1) is isotonic with a 5 % solution of a non-volatile solute. The molecular mass of this non-volatile solute is:

1. 25 g mol-1 2. 300 g mol-1
3. 350 g mol-1 4. 200 g mol-1
Subtopic:  Introduction & Colligative properties |
 81%
Level 1: 80%+
AIPMT - 2006
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KH value for some gases at the same temperature 'T' are given:
gas KH/k bar
Ar 40.3
CO2 1.67
HCHO 1.83 × 10–5
CH4 0.413
KH is Henry's Law constant in water. The order of their solubility in water is :
1. Ar < CO2 < CH4 < HCHO
2. Ar < CH4 < CO2 < HCHO
3. HCHO < CO2 < CH4 < Ar
4. HCHO < CH4 < CO2 < Ar
Subtopic:  Concentration Terms & Henry's Law |
 77%
Level 2: 60%+
NEET - 2022
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Freezing point of an aqueous solution is -0.166°C. Elevation of boiling point of same solution would be-

(Kb = 0.512 K m-1 and Kf = 1.66 K m-1)

1. 0.18°C 2. 0.05°C
3. 0.09°C 4. 0.23°C
Subtopic:  Depression of Freezing Point |
 87%
Level 1: 80%+
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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 |
 76%
Level 2: 60%+
NEET - 2021
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The electrolyte having the same value of Van't Hoff factor (i) as that of Al2(SO4)3  (if all are 100% ionized) is:

1. K2SO4 2. K3[Fe(CN)6]
3. Al(NO3)3 4. K4[Fe(CN)6]
Subtopic:  Introduction & Colligative properties | Van’t Hoff Factor |
 86%
Level 1: 80%+
NEET - 2015
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Isotonic solutions have the same:

1. Vapour pressure

2. Freezing temperature

3. Osmotic pressure

4. Boiling temperature

Subtopic:  Osmosis & Osmotic Pressure |
 91%
Level 1: 80%+
NEET - 2020
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