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. |
What does the vapor pressure of solvent containing a non-volatile solute, in a closed system directly vary with? |
| A. | Mole fraction of solute |
| B. | Mole fraction of solvent |
| C. | Molarity of solute |
| D. | Molarity of solvent |
| Answer» C. Molarity of solute | |
| 2. |
Which of the following is caused by the addition of a non-volatile solute to a solvent? |
| A. | Reduction in equilibrium of vapor pressure of solution |
| B. | Increase in melting point of the solution |
| C. | Decrease in the boiling point of the solution |
| D. | Osmosis of solute in the solution |
| Answer» B. Increase in melting point of the solution | |
| 3. |
A volatile liquid with vapor pressure 85 kPa (at sea level, 25° C) is taken to the peak of Mt. Everest. Which of the following is true? |
| A. | The vapor pressure of the solution decreases |
| B. | The solution will condense quickly than when at sea level |
| C. | The solution will vaporize quickly than when at sea level |
| D. | The vapor pressure of the solution increases |
| Answer» E. | |
| 4. |
Considering a binary solution of components A and B obeys Raoult’s law, which of the following is true? |
| A. | Total vapor pressure cannot be related to mole fraction of only one component |
| B. | Total vapor pressure of one component varies non-linearly with another component |
| C. | A plot of vapor pressures of both components gives a linear plot |
| D. | Total vapor pressure of solution always decreases with increase in mole fraction of a component |
| Answer» D. Total vapor pressure of solution always decreases with increase in mole fraction of a component | |
| 5. |
If ethanol and chloroform are present in a molar ratio of 2:3 then what is the vapor pressure at 20° C if vapor pressures of pure liquids are 5.95 kPa and 21.17 kPa, respectively? |
| A. | 16.692 kPa |
| B. | 15.082 kPa |
| C. | 8.731 kPa |
| D. | 12.038 kPa |
| Answer» C. 8.731 kPa | |
| 6. |
What deviation is shown by a mixture of equimolar phenol and aniline? |
| A. | Negative deviation |
| B. | Positive deviation |
| C. | No deviation |
| D. | Alternating positive and negative |
| Answer» B. Positive deviation | |
| 7. |
If a mixture of A and B boils at a temperature lower than the boiling point of either of the components, what kind of deviation does the mixture show? |
| A. | No deviation |
| B. | Maximum and minimum deviation from Raoult’s law |
| C. | Negative deviation from Raoult’s law |
| D. | Positive deviation from Raoult’s law |
| Answer» E. | |
| 8. |
“Total pressure of gas mixture is the sum of individual pressures”. Which law is reflected in this statement? |
| A. | Amagat’s law |
| B. | Raoult’s law |
| C. | Dalton’s law |
| D. | Henry’s law |
| Answer» D. Henry’s law | |
| 9. |
What is the boiling point of water? |
| A. | 100 °F |
| B. | 671.67 °R |
| C. | 373 °C |
| D. | 212 °r |
| Answer» C. 373 °C | |
| 10. |
What phenomenon occurs when a solution’s equilibrium vapor pressure equals the surrounding atmospheric pressure? |
| A. | Boiling |
| B. | Melting |
| C. | Condensation |
| D. | Sublimation |
| Answer» B. Melting | |