Q. No.| Assertion (A): | Helium is used to dilute oxygen in the diving apparatus. |
| Reason (R): | Helium has a high solubility in O2. |
| 1. | (A) is false but (R) is true. |
| 2. | Both (A) and (R) are true and (R) is the correct explanation of (A). |
| 3. | Both (A) and (R) are true and (R) is NOT the correct explanation of (A). |
| 4. | (A) is true but (R) is false. |
Choose the correct option:-
| 1. | 0.05 M NaCI | 2. | 0.1 M KCI |
| 3. | 0.1 M MgSO4 | 4. | 1 M NaCI |
| 1. | 1000 g of solvent | 2. | 500 mL of solvent |
| 3. | 500 g of solvent | 4. | 100 mL of solvent |
One mole of sugar is dissolved in three moles of water at 298 K. The relative lowering of vapour pressure is:
| 1. | 0.25 | 2. | 0.15 |
| 3. | 0.50 | 4. | 0.33 |
| gas | KH/k bar |
| Ar | 40.3 |
| CO2 | 1.67 |
| HCHO | 1.83 × 10-5 |
| CH4 | 0.413 |
| 1. | Ar < CO2 < CH4 < HCHO | 2. | Ar < CH4 < CO2 < HCHO |
| 3. | HCHO < CO2 < CH4 < Ar | 4. | HCHO < CH4 < CO2 < Ar |
Following solutions were prepared by dissolving 10 g of glucose (C6H12O6) in 250 ml of water (P1), 10 g of urea (CH4N2O) in 250 ml of water (P2) and 10 g of sucrose (C12H22O11) in 250 ml of water (P3). The decreasing order of osmotic pressure of these solutions is:
| 1. | P2 > P3 > P1 | 2. | P3 > P1 > P2 |
| 3. | P2 > P1 > P3 | 4. | P1 > P2 > P3 |
The correct option for the value of vapor pressure of a solution at 45 C with benzene to octane in a molar ratio 3:2 is:
[At 45 C vapor pressure of benzene is 280 mm Hg and that of octane is 420 mm Hg. Assume Ideal gas]
1. 336 mm of Hg
2. 350 mm of Hg
3. 160 mm of Hg
4. 168 mm of Hg
The mixture that shows positive deviation from Raoult's law is-
1. Benzene + Toluene
2. Acetone + Chloroform
3. Chloroethane + Bromoethane
4. Ethanol + Acetone
The freezing point of depression constant (Kf ) of benzene is 5.12 K kg mol-1. The freezing point depression for the solution of molality 0.078 m containing a non-electrolyte solute in benzene is-
(rounded off upto two decimal places):
| 1. | 0.80 K | 2. | 0.40 K |
| 3. | 0.60 K | 4. | 0.20 K |
If 8 g of a non-electrolyte solute is dissolved in 114 g of n-octane to reduce its vapor pressure to 80 %, the molar mass (in g mol–1) of the solute is -
[Molar mass of n-octane is 114 g mol–1]
| 1. | 40 | 2. | 60 |
| 3. | 80 | 4. | 20 |
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