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Q. No.The vapour pressures of benzene and toluene in pure states are 700 mm of Hg and 600 mm of Hg respectively. If equal masses of benzene and toluene are mixed together then the total vapour pressure of the solution will be approximately.
1.
620 mm of Hg
2.
640 mm of Hg
3.
654 mm of Hg
4.
674 mm of Hg
Subtopic: Raoult's Law |
69%
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Acetic acid dimerises in benzene solution. The value of Van't Hoff factor (i) for the dimerization of acetic acid is 0.6. Therefore, the percentage of dimerization of acetic acid will be:
| 1. | 20% | 2. | 40% |
| 3. | 60% | 4. | 80% |
Subtopic: Van’t Hoff Factor |
61%
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One molal solution contains 0.5 moles of a solute in:
| 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%
From NCERT
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 |
75%
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NEET - 2022
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| Assertion (A): | An ideal solution obeys Raoult's law. |
| Reason (R): | In an ideal solution, solute-solute as well as solvent-solvent, interactions are similar to solute-solvent interactions. |
| 1. | Both (A) and (R) are true and (R) is the correct explanation of (A). |
| 2. | Both (A) and (R) are true but (R) is not the correct explanation of (A). |
| 3. | (A) is true but (R) is false. |
| 4. | (A) is false but (R) is true. |
Subtopic: Raoult's Law |
87%
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Consider the two statements:
| Statement I: | At 20 °C, the molality of KCl solution is 'X' m, and on decreasing temperature to -10 °C molality remains unchanged. |
| Statement II: | On changing temperature mass remains unchanged. |
| 1. | Both Statement I and Statement II are True. |
| 2. | Both Statement I and Statement II are False. |
| 3. | Statement I is True, and Statement II is False. |
| 4. | Statement I is False, and Statement II is True. |
Subtopic: Elevation of Boiling Point | Van’t Hoff Factor |
84%
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What is the concentration of a glucose solution in intravenous injection in gram/lit which is isotonic with blood solution which has osmotic pressure 7.93 bar at 300 K ?
1. 62 g/L
2. 0.58 g/L
3. 0.62 g/L
4. 58 g/L
1. 62 g/L
2. 0.58 g/L
3. 0.62 g/L
4. 58 g/L
Subtopic: Osmosis & Osmotic Pressure |
59%
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Match List I with List II
Choose the correct answer from the options given below:
| List I | List II | ||
| Types of Solutions | Common Examples | ||
| A. | Gas in Gas | I. | Solution of hydrogen in palladium |
| B. | Solid in Gas | II. | Mixture of oxygen and nitrogen gas |
| C. | Gas in Liquid | III. | Camphor in nitrogen gas |
| D. | Gas in Solid | IV. | Oxygen dissolved in water |
| Options: | A | B | C | D |
| 1. | II | III | IV | I |
| 2. | II | I | IV | III |
| 3. | II | IV | III | I |
| 4. | II | IV | I | III |
Subtopic: Introduction & Colligative properties |
87%
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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 |
76%
From NCERT
NEET - 2022
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Negative deviation from Raoult's law is shown by-
1. Bromoethane and chloroethane
2. Ethanol and acetone
3. Chloroform and acetone
4. Benzene and toluene
1. Bromoethane and chloroethane
2. Ethanol and acetone
3. Chloroform and acetone
4. Benzene and toluene
Subtopic: Azeotrope |
83%
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