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Q. No.A living cell has an osmotic pressure of 12 atm at 300 K. A NaCl(aq) solution is isotonic with the cell. If the strength of the NaCl solution is expressed as x × 10⁻² g L⁻¹, calculate the nearest integer value of x.
Given: R = 0.08 L atm mol⁻¹ K⁻¹
1. 1246
2. 1462
3. 1602
4. 1200
Subtopic: Osmosis & Osmotic Pressure |
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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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If pure liquids A and B have a vapour pressure of 55 kPa and 15 kPa respectively. If in a solution of A and B, mole fraction of A in vapour is 0.8, then find mole fraction of A in liquid phase ?
1. 0.813
2. 0.5217
3. 0.407
4. 0.363
1. 0.813
2. 0.5217
3. 0.407
4. 0.363
Subtopic: Raoult's Law |
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Two solutes, 0.3 gm of A (Mw = 60 gm/mol) and 0.9 gm of B (Mw = 180 gm/mol) are dissolved in 100 ml solution. Find the osmotic pressure of solution at 300 K (in atm):
(Use: R = 0.082 atm-L/mol-K)
1. 1.23
2. 2.46
3. 4.92
4. 3.69
(Use: R = 0.082 atm-L/mol-K)
1. 1.23
2. 2.46
3. 4.92
4. 3.69
Subtopic: Osmosis & Osmotic Pressure |
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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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If percentage of \(N_2\) above a liquid solution is 80% at a total pressure of 10 atm then find the mole fraction of \(N_2\) gas dissolved in solution: [Given that Henry’s constant for \(N_2\) is \(7.6 \times 10^7\) mm Hg].
1. \(10^{-4}\)
2. \(8 \times 10^{-5}\)
3. \(10^{-7}\)
4. \(10^{-6}\)
1. \(10^{-4}\)
2. \(8 \times 10^{-5}\)
3. \(10^{-7}\)
4. \(10^{-6}\)
Subtopic: Concentration Terms & Henry's Law |
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Which of the following graph is correct between \(\log \mathrm{P}_{\mathrm{CO}_2}~ \mathrm{v} / \mathrm{s} ~\log \mathrm{X}_{\mathrm{CO}_2}?\)
[Given \(\mathrm{P}_{\mathrm{CO}_2}=\) Partial Pressure of \(\mathrm{CO}_2, \mathrm{X}_{\mathrm{CO}_2}=\) Mole fraction of \(CO_2\) in solution]
[Given \(\mathrm{P}_{\mathrm{CO}_2}=\) Partial Pressure of \(\mathrm{CO}_2, \mathrm{X}_{\mathrm{CO}_2}=\) Mole fraction of \(CO_2\) in solution]
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Subtopic: Concentration Terms & Henry's Law |
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Given below are two statements regarding Henry’s law constant, Kₕ:
1. Both statements are correct
2. Statement-I correct; Statement-II incorrect
3. Statement-II correct; Statement-I incorrect
4. Both statements are incorrect
| Statement-I: | For an ideal dilute solution, Kₕ does not change with a change in the concentration of the dissolved gas. |
| Statement-II: | For the same gaseous solute, Kₕ is independent of the nature of the solvent. |
1. Both statements are correct
2. Statement-I correct; Statement-II incorrect
3. Statement-II correct; Statement-I incorrect
4. Both statements are incorrect
Subtopic: Concentration Terms & Henry's Law |
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3 mol of liquid A and 1 mol of liquid B are mixed to form an ideal solution having a total vapour pressure of 500 mm Hg. When 1 mol of liquid A is added to the solution, its total vapour pressure increases by 20 mm Hg. Calculate the vapour pressure of pure liquid B, P°ᵦ.
1. 200
2. 280
3. 340
4. 400
1. 200
2. 280
3. 340
4. 400
Subtopic: Raoult's Law |
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Which of the following is the correct graph for the mixture of the volatile liquid \(CS_2\) and acetone?
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4. |  |
Subtopic: Relative Lowering of Vapour Pressure | Raoult's Law |
80%
Level 1: 80%+
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