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Q. No. Acetic acid dimerises in benzene . The value of Van't Hoff factor (i) for the dimerisation of acetic acid is 0.7. The percetage dimerisation of acetic acid will be-
1. 30%
2. 60%
3. 70%
4. 90%
Subtopic: Van’t Hoff Factor |
65%
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The boiling point of 1M Urea solution is 101°C. At the same conditions of temperature and pressure, the boiling point of 1M KCl solution will be (Assume that KCl is 100% dissociated)
1. 102°C
2. 202°C
3. 104°C
4. Data insufficient
1. 102°C
2. 202°C
3. 104°C
4. Data insufficient
Subtopic: Elevation of Boiling Point |
57%
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A mixture of ethanol and water shows a positive deviation from Raoult's law. This mixture also forms an azeotropic mixture. The boiling point of this azeotropic mixture will be
| 1. | Less than the boiling point of water but more than the boiling point of ethanol |
| 2. | More than the boiling point of water but less than the boiling point of ethanol |
| 3. | More than the boiling point of ethanol as well as water |
| 4. | Less than the boiling point of ethanol as well as water |
Subtopic: Azeotrope |
70%
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If A (volatile solute) and B (volatile solvent) form an azeotropic mixture then the correct statement regarding the above azeotropic mixture will be -
| 1. | Mole fraction of A in the vapour phase is more than the mole fraction of A or B in liquid phase |
| 2. | Mole fraction of A or B in the vapour phase is more than the mole fraction of A or B in liquid phase |
| 3. | Mole fraction of A or B in the vapour phase is same as the mole fraction of A or B in liquid phase |
| 4. | Mole fraction of A and B in the vapour phase is less than the mole fraction of A or B in liquid phase |
Subtopic: Azeotrope |
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Which of the following solutions has the minimum freezing point?
1. 0.02 M NaCl
2. 0.05 M Urea
3. 0.01 M \(MgCl_2\)
4. 0.01 M KCl
1. 0.02 M NaCl
2. 0.05 M Urea
3. 0.01 M \(MgCl_2\)
4. 0.01 M KCl
Subtopic: Van’t Hoff Factor |
61%
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In which of the following cases, value of the Van't Hoff factor (i) is the highest?
1. \(NaCl~ (dissociation = 90\%)\)
2. \(CaF_2~ (dissociation = 80\%)\)
3. \(K_4[Fe(CN)_6]~ (dissociation = 50\%)\)
4. \(AlCl_3~ (dissociation = 70\%)\)
1. \(NaCl~ (dissociation = 90\%)\)
2. \(CaF_2~ (dissociation = 80\%)\)
3. \(K_4[Fe(CN)_6]~ (dissociation = 50\%)\)
4. \(AlCl_3~ (dissociation = 70\%)\)
Subtopic: Van’t Hoff Factor |
63%
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Glucose is added to 1 litre of water to such an extent that \(\Delta T_f/K_f\) becomes equal to 1/1000. The amount of glucose added is-
1. 180 g
2. 18 g
3. 1.8 g
4. 0.18 g
1. 180 g
2. 18 g
3. 1.8 g
4. 0.18 g
Subtopic: Depression of Freezing Point |
78%
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The osmotic pressure in pascals exerted by a solution prepared by dissolving 1.0 g of polymer of molar mass 185,000 in 450 mL of water at 37°C is-
1. 37 Pa
2. 35 Pa
3. 31 pa
4. 41 Pa
1. 37 Pa
2. 35 Pa
3. 31 pa
4. 41 Pa
Subtopic: Osmosis & Osmotic Pressure |
58%
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Vapour pressure of chloroform (CHCl3) and dichloromethane (CH2Cl2) at 298 K are 200 mm Hg and 415 mm Hg respectively. The vapour pressure of the solution prepared by mixing 25.5 g of CHCl3 and 40 g of CH2Cl2 at 298 K is 347.9 mm Hg.
The mole fractions of each component, that is, CHCl3 and CH2Cl2 in vapour phase are respectively-
1 0.82; 0.18
2. 0.16; 0.84
3. 0.18; 0.82
4. 0.84; 0.16
The mole fractions of each component, that is, CHCl3 and CH2Cl2 in vapour phase are respectively-
1 0.82; 0.18
2. 0.16; 0.84
3. 0.18; 0.82
4. 0.84; 0.16
Subtopic: Raoult's Law |
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The solubility of potassium nitrate in water increases with temperature. A saturated solution of potassium nitrate at 80 °C is cooled to 25 °C in a closed container. Which of the following statements is/are correct?
| (A) | The mass of undissolved potassium nitrate will increase. |
| (B) | The concentration of the potassium nitrate solution remains the same. |
| (C) | The total mass of solvent present remains the same. |
| 1. | B and C only | 2. | A and C only |
| 3. | A only | 4. | B only |
Subtopic: Concentration Terms & Henry's Law |
61%
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