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. |
The rate constant of a reaction is 6 × 10-3 s-1 at 50° and 9 × 10-3 s-1 at 100° C. Calculate the energy of activation of the reaction. |
| A. | 6.123 kJ mol-1 |
| B. | 8.124 kJ mol-1 |
| C. | 12.357 kJ mol-1 |
| D. | 18.256 kJ mol-1 |
| Answer» C. 12.357 kJ mol-1 | |
| 2. |
What is the value of rate constant k if the value of the activation energy Ea and the frequency factor A are 49 kJ / mol and 9 × 1010 s-1 respectively? (T = 313 K) |
| A. | 6 × 102 s-1 |
| B. | 9 × 102 s-1 |
| C. | 6 × 10-2 s-1 |
| D. | 3 × 102 s-1 |
| Answer» B. 9 × 102 s-1 | |
| 3. |
The activation energy of a reaction is 50 kJ mol-1 and the value of rate constant at 300 K is 2.5×10-5 sec-1. What is the value of the frequency factor, A? |
| A. | 4228.53 s-1 |
| B. | 3829.69 s-1 |
| C. | 7596.45 s-1 |
| D. | 6565.35 s-1 |
| Answer» D. 6565.35 s-1 | |
| 4. |
What is R in the equation k = Ae-Ea/RT? |
| A. | R = 8.314 J K-1 mol-1 |
| B. | R = 3.184 J K-1 mol-1 |
| C. | R = 4.318 J K-1 mol-1 |
| D. | R = 1.438 J K-1 mol-1 |
| Answer» B. R = 3.184 J K-1 mol-1 | |
| 5. |
Which of the following represents the Boltzmann factor? |
| A. | e-Ea |
| B. | eEa |
| C. | e-Ea/RT |
| D. | eEa/RT |
| Answer» D. eEa/RT | |
| 6. |
Which of the following is the correct Arrhenius equation? |
| A. | k = A eEa/RT |
| B. | k = A eEa/T |
| C. | k = A eEa/R |
| D. | k = A e-Ea/RT |
| Answer» E. | |
| 7. |
What happens to the peak of the curve in the Maxwell-Boltzmann distribution graph if temperature increases? |
| A. | Shifts forward and upward |
| B. | Shifts forward and downward |
| C. | Shifts backward and upward |
| D. | Shifts backward and downward |
| Answer» C. Shifts backward and upward | |
| 8. |
The rate of reaction increases with a rise in temperature. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 9. |
Which of the following is the correct expression for the temperature coefficient (n)? |
| A. | n = Rate constant at T + 10°/Rate constant at T° |
| B. | n = Rate constant at T + 20°/Rate constant at T° |
| C. | n = Rate constant at T + 30°/Rate constant at T° |
| D. | n = Rate constant at T + 40°/Rate constant at T° |
| Answer» B. n = Rate constant at T + 20°/Rate constant at T° | |
| 10. |
The rate of a reaction depends on the temperature. |
| A. | True |
| B. | False |
| Answer» B. False | |