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Q. No.Which of the following contains 0.5 moles of a solute in one molal solution?
1.
1000 g of solvent
2.
500 mL of solvent
3.
500 g of solvent
4.
100 mL of solvent
Subtopic: Concentration Terms & Henry's Law |
74%
Level 2: 60%+
NEET - 2022
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One mole of sugar is dissolved in three moles of water at 298 K. The relative lowering of vapour pressure is:
| 1. | 0.25 | 2. | 0.15 |
| 3. | 0.50 | 4. | 0.33 |
Subtopic: Relative Lowering of Vapour Pressure |
76%
Level 2: 60%+
NEET - 2022
Hints
KH value for some gases at the same temperature 'T' are given:
KH is Henry's Law constant in water. The order of their solubility in water is :
| gas | KH/k bar |
| Ar | 40.3 |
| CO2 | 1.67 |
| HCHO | 1.83 × 10–5 |
| CH4 | 0.413 |
| 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
Hints
Given below are two statements: one is labeled as Assertion (A) and the other is labeled as Reason (R):
In light of the above statements, choose the correct answer from the options given below:
| Assertion (A): | Helium is used to dilute oxygen in the diving apparatus. |
| Reason (R): | Helium has a high solubility in O2. |
| 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
Hints
Which of the following aqueous solutions of electrolytes will exhibit the least elevation in boiling point?
| 1. | 0.05 M NaCl | 2. | 0.1 M KCl |
| 3. | 0.1 M MgSO4 | 4. | 0.1 M NaCl |
Subtopic: Van’t Hoff Factor |
77%
Level 2: 60%+
NEET - 2023
Hints
Vapour pressure of pure water at 298 K is 23.8 mm Hg. 50 g of urea (NH2CONH2) is dissolved in 850 g of water.
The vapour pressure of water (in mm Hg) for this solution is :
The vapour pressure of water (in mm Hg) for this solution is :
| 1. | 23.40 | 2. | 0.23 |
| 3. | 12.87 | 4. | 40.14 |
Subtopic: Raoult's Law |
67%
Level 2: 60%+
Hints
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
Hints
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 pressures of these solutions is:
| 1. | P2 > P3 > P1 | 2. | P3 > P1 > P2 |
| 3. | P2 > P1 > P3 | 4. | P1 > P2 > P3 |
Subtopic: Osmosis & Osmotic Pressure |
73%
Level 2: 60%+
NEET - 2021
Hints
Subtopic: Elevation of Boiling Point |
76%
Level 2: 60%+
Hints
Subtopic: Raoult's Law |
89%
Level 1: 80%+
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