MCQOPTIONS
Saved Bookmarks
MCQOPTIONS
This section includes 11 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 order of the reaction, if the time of half-completion is changed from 50 sec to 25 sec, when the initial concentration is changed from 0.5 to 1M will be ___________ |
| A. | 0 |
| B. | 1 |
| C. | 2 |
| D. | 3 |
| Answer» D. 3 | |
| 2. |
The half life period of nth order reaction varies inversely to ____________ th power of the initial concentration of the reactants. |
| A. | n |
| B. | 2n |
| C. | (n+1) |
| D. | (n-1) |
| Answer» E. | |
| 3. |
Which of the following is not an example of second order reaction? |
| A. | Oxidation of hydrogen bromide |
| B. | Saponification of ester |
| C. | Acid catalyzed hydrolysis of ester |
| D. | Gaseous decomposition of hydrogen iodide |
| Answer» D. Gaseous decomposition of hydrogen iodide | |
| 4. |
For a second order reaction, the rate is proportional to the square root of the concentration of the same reactant. |
| A. | True |
| B. | False |
| Answer» C. | |
| 5. |
The half life period of first order reaction is 15 min. Its rate constant will be equal to ___________ |
| A. | 0.0462 min<sup>-1</sup> |
| B. | 0.462 min<sup>-1</sup> |
| C. | 0.00462 min<sup>-1</sup> |
| D. | 0.562 min<sup>-1</sup> |
| Answer» B. 0.462 min<sup>-1</sup> | |
| 6. |
In a first order reaction, the time required for the completion of 99% is _______ times the time required for the completion of half of the reaction. |
| A. | 5 |
| B. | 10 |
| C. | 20 |
| D. | 50 |
| Answer» C. 20 | |
| 7. |
A compound decomposes according to the first order rate law with a half life period of 30 min. What will be the fraction of the remaining compound after 120 min? |
| A. | 0.625 |
| B. | 0.0625 |
| C. | 0.25 |
| D. | 0.025 |
| Answer» C. 0.25 | |
| 8. |
The thermal decomposition of nitrogen pentaoxide in the gaseous phase is the example of ___________ |
| A. | Zero order reaction |
| B. | Half order reaction |
| C. | First order reaction |
| D. | Second order reaction |
| Answer» D. Second order reaction | |
| 9. |
For a first order reaction, the half life period is independent of the ___________ |
| A. | Initial concentration of the reactants |
| B. | Final concentration of the reactants |
| C. | Rate constant |
| D. | Concentration of products |
| Answer» B. Final concentration of the reactants | |
| 10. |
The half-life period of zero order reaction is directly proportional to the ___________ |
| A. | Rate constant |
| B. | Initial concentration of reactants |
| C. | Final concentration of reactants |
| D. | Concentration of products |
| Answer» C. Final concentration of reactants | |
| 11. |
For a zero order reaction, the rate of reaction is independent of ___________ |
| A. | Temperature |
| B. | Nature of reactants |
| C. | Concentration of reactants |
| D. | Effect of catalyst |
| Answer» D. Effect of catalyst | |