Q. No.A solution is prepared by dissolving 15 g of a non-volatile solute in 150 g of a solvent. The elevation in boiling point of the solution is 0.5 °C. If the relative lowering of vapour pressure is x × 10⁻², determine the value of x.
(Given molar mass of solvent = 300 gm/mole, Kb = 5 K-kg/mol)
1. 3
2. 6
3. 9
4. 15
(Given molar mass of solvent = 300 gm/mole, Kb = 5 K-kg/mol)
1. 3
2. 6
3. 9
4. 15
Subtopic: Elevation of Boiling Point |
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Find the mole fraction of a non-volatile electrolyte solute when W g of the solute is dissolved in 100 mL of water.
The vapour pressures of pure water and the solution are 640 mm Hg and 600 mm Hg, respectively.
The boiling point of the solution is 375 K.
Given:
Kᵦ(H₂O) = 0.52 K kg mol⁻¹
Molar mass of solute = M g mol⁻¹
Select the correct expression for Xₛₒₗᵤₜₑ:
1. 1.3/8 (W/M)2. 8/1.3 (W/M)
3. 2.6/16 (M/W)
4. 1.3/8 (M/W)
Subtopic: Elevation of Boiling Point |
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The boiling point of the solution, when two moles each of ethylene glycol and glucose are mixed with 500 mL of water, is: (Given: \(k_b=0.52 ~\mathrm{K} / \mathrm{kg} / \mathrm{m} \))
1. \(377.16~K\)
2. \(368.84~K\)
3. \(376.16~K\)
4. \(369.84~K\)
1. \(377.16~K\)
2. \(368.84~K\)
3. \(376.16~K\)
4. \(369.84~K\)
Subtopic: Elevation of Boiling Point |
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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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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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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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\(2~ \text{g}\) of a non-volatile solute is dissolved in \(200~ \text{g}\) of two different solvents A and B to form solutions of equal molality. If their ebullioscopic constants are in the ratio of \(1 : 8\) and the elevation in boiling points of A and B is in the ratio \(\mathrm {(x : y)}\), the value of \(\mathrm{y}\) is:
| 1. | Four (4) | 2. | Six (6) |
| 3. | Ten (10) | 4. | Eight (8) |
Subtopic: Elevation of Boiling Point |
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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 |
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A solution containing \(\mathrm{2.5 × 10^{–3} ~kg}\) of a solute dissolved in \(\mathrm{75 × 10^{–3}~kg}\) of water boils at \(\mathrm{373.535~ K.}\)The molar mass of the solute is:
(Given: \(\mathrm{K_b(H_2O) = 0.52 ~K ~kg ~mol^{–1}}\) and boiling point of water \(\mathrm{= 373.15~ K}\))
1. 25
2. 30
3. 45
4. 50
(Given: \(\mathrm{K_b(H_2O) = 0.52 ~K ~kg ~mol^{–1}}\) and boiling point of water \(\mathrm{= 373.15~ K}\))
1. 25
2. 30
3. 45
4. 50
Subtopic: Elevation of Boiling Point |
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Level 1: 80%+
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