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Q. No.For a living cell, osmotic pressure is 12 atm at 300K, which is isotonic with NaCl(aq.) solution then strength of NaCl solution is \(x\times 10^{-2} g/L\); find the value of \(x\) in nearest integer:
[ R= 0.08 L-atm/mol-K]
1. 1246
2. 1462
3. 1602
4. 1200
Subtopic: Osmosis & Osmotic Pressure |
Level 4: Below 35%
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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 |
Level 4: Below 35%
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W gm of non-volatile electrolyte solute is added in 100 ml pure water \((P^0=640\) mm Hg) showing vapour pressure of solution 600 mm Hg.
This solution have b.p of 375 K.
Given \(\mathrm{K}_{\mathrm{b}} \text { of } \mathrm{H}_2 \mathrm{O}=0.52 \frac{\mathrm{~K}-\mathrm{kg}}{\mathrm{~mol}} \text {, }\)
Molar mass of solute = M
Select the correct options about mole fraction of solute \(\left(\mathrm{X}_{\text {solute }}\right).\)
1. \(\frac{1.3}{8}\left(\frac{\mathrm{~W}}{\mathrm{M}}\right)~\)
2. \(\frac{8}{1.3}\left(\frac{\mathrm{~W}}{\mathrm{M}}\right)~\)
3. \(\frac{2.6}{16}\left(\frac{\mathrm{~M}}{\mathrm{W}}\right)~\)
4. \(\frac{1.3}{8}\left(\frac{\mathrm{~M}}{\mathrm{W}}\right)~\)
This solution have b.p of 375 K.
Given \(\mathrm{K}_{\mathrm{b}} \text { of } \mathrm{H}_2 \mathrm{O}=0.52 \frac{\mathrm{~K}-\mathrm{kg}}{\mathrm{~mol}} \text {, }\)
Molar mass of solute = M
Select the correct options about mole fraction of solute \(\left(\mathrm{X}_{\text {solute }}\right).\)
1. \(\frac{1.3}{8}\left(\frac{\mathrm{~W}}{\mathrm{M}}\right)~\)
2. \(\frac{8}{1.3}\left(\frac{\mathrm{~W}}{\mathrm{M}}\right)~\)
3. \(\frac{2.6}{16}\left(\frac{\mathrm{~M}}{\mathrm{W}}\right)~\)
4. \(\frac{1.3}{8}\left(\frac{\mathrm{~M}}{\mathrm{W}}\right)~\)
Subtopic: Elevation of Boiling Point |
Level 4: Below 35%
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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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2. |  |
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4. |  |
Subtopic: Concentration Terms & Henry's Law |
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Level 2: 60%+
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Given below are two statements:
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: | \(K_{H}\) for ideal dilute solution does not change with varying the concentration of solute. |
| Statement-II: | \(K_{H}\) for solution having same gas solute is independent of nature of 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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Level 3: 35%-60%
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3 moles of liquid A and 1 mole of liquid B are mixed to form an ideal solution. The vapour pressure of solution becomes 500 mm Hg. If 1 mole of A is further added then vapour pressure of solution increases by 20 mm Hg.
Find vapour pressure of pure \(B (P°_B )\) in mm Hg:
1. 200
2. 280
3. 340
4. 400
Find vapour pressure of pure \(B (P°_B )\) in mm Hg:
1. 200
2. 280
3. 340
4. 400
Subtopic: Raoult's Law |
69%
Level 2: 60%+
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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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2. |  |
| 3. |  |
4. |  |
Subtopic: Relative Lowering of Vapour Pressure | Raoult's Law |
79%
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