MCQOPTIONS
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MCQOPTIONS
This section includes 9 Mcqs, each offering curated multiple-choice questions to sharpen your Engineering Chemistry knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
The molar heat of vaporisation ( Hvap) for water is ____________ |
| A. | 40.79 kJ/mol |
| B. | 31.0 kJ/mol |
| C. | 59.0 kJ/mol |
| D. | 9.2 kJ/mol |
| Answer» B. 31.0 kJ/mol | |
| 2. |
For a given substance, choose the correct statement. |
| A. | H<sub>fus</sub> is greater than H<sub>vap</sub> |
| B. | H<sub>fus</sub> is equal to H<sub>vap</sub> |
| C. | H<sub>fus</sub> is smaller than H<sub>vap</sub> |
| D. | None of the mentioned |
| Answer» D. None of the mentioned | |
| 3. |
The boiling point and molar heat of vaporisation is dependent on ____________ |
| A. | Strength of the inter-molecular forces |
| B. | Composition of the liquid compound |
| C. | Size of the molecules |
| D. | All of the mentioned |
| Answer» B. Composition of the liquid compound | |
| 4. |
At 1 atm pressure, the boiling point of water is ____________ |
| A. | 0 <sup>0</sup>C |
| B. | 100<sup>0</sup>C |
| C. | -100<sup>0</sup>C |
| D. | None of the mentioned |
| Answer» C. -100<sup>0</sup>C | |
| 5. |
The energy required to vaporize 1 mole of a liquid is known as ____________ |
| A. | Molar heat of fusion |
| B. | Molar heat of freezing |
| C. | Molar heat of boiling |
| D. | Molar heat of vaporisation |
| Answer» E. | |
| 6. |
If the non-volatile impurities contaminate the liquid, its boiling point gets ____________ |
| A. | Depressed |
| B. | Elevated |
| C. | Remains same |
| D. | None of the mentioned |
| Answer» C. Remains same | |
| 7. |
The normal boiling point of a liquid is the temperature at which it boils when the external pressure is ____________ |
| A. | 1 atm |
| B. | 2 atm |
| C. | 3 atm |
| D. | 5 atm |
| Answer» B. 2 atm | |
| 8. |
The boiling point of a liquid is the temperature at which the vapour pressure ____________ |
| A. | Is equal to the internal pressure |
| B. | Is equal to the external pressure |
| C. | Is greater than an internal pressure |
| D. | Is lesser than an internal pressure |
| Answer» C. Is greater than an internal pressure | |
| 9. |
On increasing the temperature of a liquid, its vapour pressure ____________ |
| A. | Decreases |
| B. | Remain constant |
| C. | Increases |
| D. | None of the mentioned |
| Answer» D. None of the mentioned | |