MCQOPTIONS
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MCQOPTIONS
This section includes 13 Mcqs, each offering curated multiple-choice questions to sharpen your Corrosion Engineering knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
What is the Nernst equation for chemical reaction nA + mB ==> pC + qD at temperature T? |
| A. | E=E0+2.3(RT/nF)log{([A]n+[B]m)/([C]p+[D]q)} |
| B. | E=2.3(RT/nF)log{([A]n+[B]m)/([C]p+[D]q)} |
| C. | E=E0+2.3(RT/nF)log{([n]A+[m]B)/([p]C+ [q]D)} |
| D. | E=2.3(RT/nF)log{([n]A+[m]B)/([p]C+ [q]D)} |
| Answer» B. E=2.3(RT/nF)log{([A]n+[B]m)/([C]p+[D]q)} | |
| 2. |
Which of the following metal is used as a solid interface for hydrogen gas in the standard hydrogen electrode? |
| A. | Copper |
| B. | Zinc |
| C. | Gold |
| D. | Platinized platinum |
| Answer» E. | |
| 3. |
What is the overall standard cell potential of a given Cu-Fe system? |
| A. | +0.78V |
| B. | -0.14V |
| C. | -0.78V |
| D. | +0.14 |
| Answer» B. -0.14V | |
| 4. |
What are the cathodic and anodic reactions respectively of a given Cu-Zn system? |
| A. | Cu==>Cu+2+2e and Zn+2+2e==>Zn |
| B. | Cu+2+2e==>Cu and Zn==>Zn+2+2e |
| C. | Cu==>Cu+2+2e and 2Zn+1+2e==>2Zn |
| D. | Cu+2+2e==>Cu and 2Zn==>2Zn+1+2e |
| Answer» C. Cu==>Cu+2+2e and 2Zn+1+2e==>2Zn | |
| 5. |
Which of the following is/are correct regarding the given figure? |
| A. | It is a reversible cell with unit activity |
| B. | Copper and zinc are cathode and anode respectively |
| C. | It is a reversible cell of Cu-Zn system with standard cell potential of 1.10V, copper and zinc are cathode and anode respectively |
| D. | The standard cell potential is 1.10V |
| Answer» D. The standard cell potential is 1.10V | |
| 6. |
What is the change in Gibb’s free energy of a Cu-Zn system with a cell potential of 1.10V? |
| A. | -11.13 KJ/mol |
| B. | +21.23 KJ/mol |
| C. | +11.13 KJ/mol |
| D. | -21.23 KJ/mol |
| Answer» E. | |
| 7. |
Which of the following formula is used to calculate the Gibbs free energy of an electrochemical reaction? |
| A. | ΔG=-nFE0cell |
| B. | ΔG=+nFE0cell |
| C. | ΔG=-nFEcell |
| D. | ΔG=+nFEcell |
| Answer» D. ΔG=+nFEcell | |
| 8. |
The change in Gibbs free energy is a path function and it is independent of the state of the system. |
| A. | False |
| B. | True |
| Answer» B. True | |
| 9. |
Which of the following is a spontaneous reaction? |
| A. | Production of ammonia |
| B. | Corrosion of metals |
| C. | Photosynthesis reaction |
| D. | Generation of oxygen from water |
| Answer» C. Photosynthesis reaction | |
| 10. |
Which of the following is true, if the transition of a system results in positive Gibbs free energy change? |
| A. | It is a spontaneous reaction |
| B. | Free energy of products is less |
| C. | It is a non-spontaneous reaction |
| D. | Free energy of reactants is more |
| Answer» D. Free energy of reactants is more | |
| 11. |
If the transition of a system from one state to another state resulted in negative free energy change then it is known as a spontaneous reaction. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 12. |
What is the direct measure of work capacity or electrical energy available from a system? |
| A. | Change in enthalpy |
| B. | Change in Gibbs free energy |
| C. | Reaction time |
| D. | Concentration of reactants |
| Answer» C. Reaction time | |
| 13. |
Which of the following is/are the applications of modern electrode kinetic principles? |
| A. | Anodic protection |
| B. | Noble metal alloying |
| C. | Methods to measure corrosion rates rapidly |
| D. | Anodic protection, noble metal alloying and methods to measure corrosion rates rapidly |
| Answer» E. | |