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Q. No.What is the molality of Na+ in a solution containing 3.00 g NaCl (M=58.4), 9.00 g glucose (M=180.0), and 168 g H2O (M=18.0)?
1. 5.50 × 10-3 m
2. 0.285 m
3. 0.306 m
4. 0.777 m
1. 5.50 × 10-3 m
2. 0.285 m
3. 0.306 m
4. 0.777 m
Subtopic: Concentration Terms & Henry's Law |
Level 3: 35%-60%
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Which of the following is the correct statement about Henry's law?
| 1. | The gas in contact with the liquid should behave as an ideal gas. |
| 2. | There should not be any chemical interaction between the gas and the liquid. |
| 3. | The pressure applied should be high. |
| 4. | All of the above. |
Subtopic: Concentration Terms & Henry's Law |
Level 4: Below 35%
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The vapour pressures of two pure isomeric liquids, X and Y, are 200 torr and 100 torr, respectively, at a given temperature. Assuming a solution of these components to obey Raoult’s law, the mole fraction of component Y in the vapour phase in equilibrium with the solution containing equal amounts of X and Y at the same temperature is:
1. 0.33
2. 0.50
3. 0.66
4. 0.80
1. 0.33
2. 0.50
3. 0.66
4. 0.80
Subtopic: Raoult's Law |
Level 3: 35%-60%
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Given below are two statements :
In light of the above statements choose the correct answer from the options given below:
| Statement I: | The proportionality constant, Kf, depends on the nature of the solvent as well as the solute. |
| Statement II: | When blood cells are placed in water containing less than 0.9 % (mass/volume) salt, blood cells shrink due to osmosis. |
In light of the above statements choose the correct answer from the options given below:
| 1. | Statement I is correct; Statement II is incorrect |
| 2. | Statement I is incorrect; Statement II is incorrect |
| 3. | Statement I is incorrect; Statement II is correct |
| 4. | Statement I is correct; Statement II is correct |
Subtopic: Raoult's Law |
Level 3: 35%-60%
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An open beaker of water in equilibrium with water vapour is in a sealed container.
When a few grams of glucose are added to the beaker of water,
the rate at which water molecules :
When a few grams of glucose are added to the beaker of water,
the rate at which water molecules :
| 1. | Leaves the vapour increases |
| 2. | Leaves the solution increases |
| 3. | Leaves the solution decreases |
| 4. | Leaves the vapour decreases |
Subtopic: Relative Lowering of Vapour Pressure |
Level 4: Below 35%
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Which one of the following are in equilibrium during the depression of the freezing point in a solution?
1. Liquid solvent, Solid solvent
2. Liquid solvent, Solid solute
3. Liquid solute, Solid solute
4. Liquid solute, Solid solvent
1. Liquid solvent, Solid solvent
2. Liquid solvent, Solid solute
3. Liquid solute, Solid solute
4. Liquid solute, Solid solvent
Subtopic: Depression of Freezing Point |
Level 3: 35%-60%
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When mercuric iodide is added to the aqueous solution of potassium iodide then:
| 1. | The freezing point is raised. |
| 2. | The freezing point is lowered. |
| 3. | The freezing point does not change. |
| 4. | The boiling point does not change. |
Subtopic: Van’t Hoff Factor |
Level 3: 35%-60%
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Choose the correct statement from the following:
| 1. | Nitric acid (68%) and water (32%) mixture is an example of the minimum boiling azeotrope. |
| 2. | Osmosis can be reversed if pressure lower than the osmotic pressure is applied to the solution. |
| 3. | As compared to other colligative properties, the magnitude of osmotic pressure is large even for very dilute solutions. |
| 4. | The condition of anoxia in mountain climbers is an application of Raoult's law. |
Subtopic: Introduction & Colligative properties | Azeotrope | Concentration Terms & Henry's Law |
51%
Level 3: 35%-60%
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Which substances exhibit the highest solubility in the specified liquid at 298 K and 1 atm pressure?
| 1. | Sodium chloride in liquid cyclohexane |
| 2. | Bromine in liquid hexane |
| 3. | Hydrogen in liquid water |
| 4. | Potassium bromide in liquid tetrachloromethane |
Subtopic: Introduction & Colligative properties |
Level 3: 35%-60%
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40 cm3 of a solution of sodium hydroxide is exactly neutralized by 25 cm3 of 0.40 mol L–1 sulphuric acid.
2NaOH + H2SO4 → Na2SO4 + 2H2O
What is the concentration, in g L–1, of the sodium hydroxide solution?
[Molecular mass value: NaOH = 40]
1. 20 gL-1
2. 5 gL-1
3. 0.25 gL-1
4. 10 gL-1
2NaOH + H2SO4 → Na2SO4 + 2H2O
What is the concentration, in g L–1, of the sodium hydroxide solution?
[Molecular mass value: NaOH = 40]
1. 20 gL-1
2. 5 gL-1
3. 0.25 gL-1
4. 10 gL-1
Subtopic: Concentration Terms & Henry's Law |
Level 3: 35%-60%
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