MCQOPTIONS
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MCQOPTIONS
This section includes 10 Mcqs, each offering curated multiple-choice questions to sharpen your Chemistry knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
Which is the most appropriate method for determining the molar masses of biomolecules? |
| A. | Relative lowering of vapor pressure |
| B. | Elevation of boiling point |
| C. | Depression in freezing point |
| D. | Osmosis |
| Answer» E. | |
| 2. |
What is a necessary condition for osmosis to take place? |
| A. | Semi-permeable membrane |
| B. | Same concentration of solvent |
| C. | High temperature |
| D. | Pressure greater than osmotic pressure |
| Answer» B. Same concentration of solvent | |
| 3. |
A cell with lots of salt inside it is placed in a vessel containing just water. Which process takes place? |
| A. | Dialysis |
| B. | Filtration |
| C. | Shriveling |
| D. | Osmosis |
| Answer» E. | |
| 4. |
A pair of solution bears the same osmotic pressure. What is this pair of solutions called? |
| A. | Hypertonic |
| B. | Hypotonic |
| C. | Isotonic |
| D. | Osmolarity |
| Answer» D. Osmolarity | |
| 5. |
What are colligative properties useful for? |
| A. | Determining boiling and melting temperature |
| B. | Determining molar mass |
| C. | Determining equivalent weight |
| D. | Determining van t Hoff factor |
| Answer» C. Determining equivalent weight | |
| 6. |
Pure CS2 melts at -112 C. 228 grams of propylene glycol crystals is mixed with 500 grams of CS2. If kf of CS2 = -3.83 K kg mol-1 what is the depression in freezing point? |
| A. | -23 C |
| B. | -135 C |
| C. | -20 C |
| D. | -100 C |
| Answer» B. -135 C | |
| 7. |
Boiling point of chloroform is 61 C. After addition of 5.0 g of a non-volatile solute to 20 g chloroform boils at 64.63 C. If kb = 3.63 K kg mol-1, what is the molecular weight of the solute? |
| A. | 320 g/mol |
| B. | 100 g/mol |
| C. | 400 g/mol |
| D. | 250 g/mol |
| Answer» E. | |
| 8. |
117 g of NaCl is added to 222 g of water in a saucepan. At what does temperature does water boil at 101.325 kPa? Ebullioscopy constant for water = 0.52 K kg mol-1 and b.p. = 100 C |
| A. | 98.3 C |
| B. | 102.8 C |
| C. | 104.7 C |
| D. | 101.5 C |
| Answer» D. 101.5 C | |
| 9. |
At 70 C the vapor pressure of pure water is 31 kPa. Which of the following is most likely the vapor pressure of a 2.0 molal aq. glucose solution at 70 C? |
| A. | 30.001 kPa |
| B. | 29.915 kPa |
| C. | 28.226 kPa |
| D. | 32.392 kPa |
| Answer» C. 28.226 kPa | |
| 10. |
Why is raising of viscosity of a solution after addition of solute, not considered to be a colligative property? |
| A. | The resultant viscosity depends on the nature of the solute |
| B. | The resultant viscosity depends on the amount of solute |
| C. | The resultant viscosity depends on the nature of solvent |
| D. | The resultant viscosity depends on the amount of solvent |
| Answer» B. The resultant viscosity depends on the amount of solute | |