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Q. No.If a compound AB dissociates to the extent of 75% in an aqueous solution, the molality of the solution which shows a 2.5 K rise in the boiling point of the solution is:
(Rounded-off to the nearest integer) [Kb = 0.52K kg mol–1]
1. 3
2. 5
3. 7
4. 2
Subtopic: Elevation of Boiling Point |
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Level 2: 60%+
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1 g of a non-volatile non-electrolyte solute is dissolved in 100 g of two different solvents A and B whose ebullioscopic constants are in the ratio of 1 : 5. The ratio of the elevation in their boiling points, , is:
1. 5:1
2. 1:2
3. 10:1
4. 1:5
Subtopic: Elevation of Boiling Point |
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Level 1: 80%+
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2 grams of non-volatile solute dissolves in 200 grams each of two different solvents A and B to attain the same molality. If the ratio of \(K_b \) of solvent A and B is 1:8 and the ratio of elevation in boiling points is x:y, then the value of y is:
1. 4
2. 6
3. 10
4. 8
1. 4
2. 6
3. 10
4. 8
Subtopic: Elevation of Boiling Point |
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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 |
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If 25 mL of KCl solution requires 20 mL of 1 M AgNO3 solution for complete precipitation of KCl solution. The value of ΔTf of a KCl solution (i = 2) is:
(Kf = 1.86 K. kg mol−1. Assume molarity = molality)
(Round off to nearest integer)
1. 5 K
2. 3 K
3. 6 K
4. 1 K
(Kf = 1.86 K. kg mol−1. Assume molarity = molality)
(Round off to nearest integer)
1. 5 K
2. 3 K
3. 6 K
4. 1 K
Subtopic: Elevation of Boiling Point |
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Level 2: 60%+
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The elevation in boiling point for 1 molal solution of a non-volatile solute A is 3 K. The depression in the freezing point for 2 molal solutions of A in the same solvent is 6 K. The ratio of \(K_b \text { and } K_f \text { i.e., } K_b / K_f~\text{is}~1:x.\)
Find the value of \(x\):
Find the value of \(x\):
| 1. | Seven (7) | 2. | Three (3) |
| 3. | One (1) | 4. | Two (2) |
Subtopic: Elevation of Boiling Point | Depression of Freezing Point |
82%
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The boiling point of a \(\text { 2% }\)aqueous solution of a non-volatile solute A is equal to the boiling point of \(\text { 8% }\)aqueous solution of a non-volatile solute B. What is the correlation between the molecular weights of A and B?
| 1. | MA = 4MB | 2. | MB = 4MA |
| 3. | MA = 8MB | 4. | MB = 8MA |
Subtopic: Elevation of Boiling Point |
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Level 2: 60%+
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