MCQOPTIONS
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MCQOPTIONS
This section includes 8 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. |
Which of the following is the condition for high and low quantum yield? |
| A. | The reactivity of the molecules should be temperature dependent |
| B. | All the reactant molecules should be in the different energy state |
| C. | The molecules in the activated state should be largely unstable and decompose to form the products |
| D. | quantum field=1 |
| Answer» D. quantum field=1 | |
| 2. |
Decomposition of HI has quantum yield = _______ |
| A. | 1 |
| B. | 2 |
| C. | 0 |
| D. | 4 |
| Answer» C. 0 | |
| 3. |
When the number of molecules decomposed is less than one per photon, the reaction has ______ quantum yield. |
| A. | low |
| B. | high |
| C. | unpredictable |
| D. | variable |
| Answer» B. high | |
| 4. |
When two or more molecules are decomposed per photon, the reaction has ______ quantum yield. |
| A. | high |
| B. | low |
| C. | unpredictable |
| D. | variable |
| Answer» B. low | |
| 5. |
If a reaction obeys Einstein law, quantum yield is _______ |
| A. | 1 |
| B. | more than 1 |
| C. | less than 1 |
| D. | 0 |
| Answer» B. more than 1 | |
| 6. |
Quantum efficiency is given by _______ |
| A. | nNhc/q |
| B. | nq/Nhc |
| C. | q /nNhc |
| D. | nc /Nhq |
| Answer» B. nq/Nhc | |
| 7. |
Classification of photochemical reaction on the basis of quantum efficiency can be done into ______ categories. |
| A. | 3 |
| B. | 2 |
| C. | 4 |
| D. | 5 |
| Answer» B. 2 | |
| 8. |
To express the relationship between the number of molecules reacting with the number of photons absorbed, the concept of _____ was introduced. |
| A. | quantum efficiency |
| B. | photon analysis |
| C. | quantum mechanism |
| D. | photon degradation |
| Answer» B. photon analysis | |