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Q. No.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 |
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The Van't Hoff factor (i) for a dilute solution of \(Al_2(SO_4)_3 \) is:
1. \(1+\alpha/4 \)
2. \(1+\alpha \)
3. \(1-3\alpha \)
4. \(1+4\alpha \)
1. \(1+\alpha/4 \)
2. \(1+\alpha \)
3. \(1-3\alpha \)
4. \(1+4\alpha \)
Subtopic: Van’t Hoff Factor |
85%
From NCERT
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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 |
79%
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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 |
65%
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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 |
62%
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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 |
71%
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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 |
58%
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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 |
64%
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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 |
66%
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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 |
60%
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