MCQOPTIONS
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MCQOPTIONS
This section includes 15 Mcqs, each offering curated multiple-choice questions to sharpen your Chemistry knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
Which of the following conditions are satisfied when the cell reaction in the electrochemical cell is spontaneous? |
| A. | G > 0 |
| B. | E <sub>cell</sub> < 0 |
| C. | E <sub>cell</sub> = 0 |
| D. | G < 0 |
| Answer» E. | |
| 2. |
What is the observation when the opposing external applied potential to an electrochemical cell is greater than the cell s potential? |
| A. | The electrochemical cell behaves like an electrolytic cell |
| B. | The electrochemical cell stops functioning |
| C. | Only oxidation reactions occur in the cell |
| D. | Only reduction reactions occur in the cell |
| Answer» B. The electrochemical cell stops functioning | |
| 3. |
Which of the following statements regarding primary cells is false? |
| A. | Primary cells cannot be recharged |
| B. | They have low internal resistance |
| C. | They have an irreversible chemical reaction |
| D. | Their initial cost is cheap |
| Answer» C. They have an irreversible chemical reaction | |
| 4. |
Which of the following is a not a secondary cell? |
| A. | Nickel-cadmium cell |
| B. | Lead storage cell |
| C. | Mercury cell |
| D. | Leclanche cell |
| Answer» E. | |
| 5. |
What is the direction of flow of electrons in an electrolytic cell? |
| A. | Anode to cathode externally |
| B. | Anode to cathode internally |
| C. | Cathode to anode externally |
| D. | Cathode to anode in the solution |
| Answer» B. Anode to cathode internally | |
| 6. |
Which of the following is not a type of electrochemical cell? |
| A. | Voltaic cell |
| B. | Photovoltaic cell |
| C. | Electrolytic cell |
| D. | Fuel Cell |
| Answer» C. Electrolytic cell | |
| 7. |
Which of the following is not a characteristic feature of a salt bridge? |
| A. | Salt bridge joins the two halves of an electrochemical cell |
| B. | It completes the inner circuit |
| C. | It is filled with a salt solution (or gel) |
| D. | It does not maintain electrical neutrality of the electrolytic solutions of the half-cells |
| Answer» E. | |
| 8. |
Why are the saturated solutions of electrolytes for the salt bridge prepared in agar-agar jelly or gelatin? |
| A. | The jelly acts as an electrolyte |
| B. | It helps the electrolytes to mix with the contents of the half cells |
| C. | It helps maintain the electrical polarity between the two half-cell solutions |
| D. | It keeps the electrolyte in semi-solid phase and prevents it from mixing with the two half-cell solutions |
| Answer» E. | |
| 9. |
Which of the following factors does not affect the electrode potential of an electrode? |
| A. | Nature of the electrode (metal) |
| B. | Temperature of the solution |
| C. | Molarity of the solution |
| D. | Size of the electrode |
| Answer» E. | |
| 10. |
Which of the following statements is correct regarding Electrochemical cells? |
| A. | Cell potential is an extensive property |
| B. | Cell potential is an intensive property |
| C. | The Gibbs free energy of an electrochemical cell is an intensive property |
| D. | Gibbs free energy is undefined for an electrochemical cell |
| Answer» C. The Gibbs free energy of an electrochemical cell is an intensive property | |
| 11. |
When no current is drawn through an electrochemical cell, the sum of the electrode potentials of the two electrodes is called cell emf. True or False? |
| A. | True |
| B. | False |
| Answer» B. False | |
| 12. |
Which of the following is not a generally used electrolyte in the salt bridges used to connect the two half-cells of an electrochemical cell? |
| A. | NaCl |
| B. | KNO<sub>3</sub> |
| C. | KCl |
| D. | ZnSO<sub>4</sub> |
| Answer» E. | |
| 13. |
When equilibrium is reached inside the two half-cells of the electrochemical cells, what is the net voltage across the electrodes? |
| A. | > 1 |
| B. | < 1 |
| C. | = 0 |
| D. | Not defined |
| Answer» D. Not defined | |
| 14. |
An electrochemical cell generally consists of a cathode and an anode. Which of the following statements is correct with respect to the cathode? |
| A. | Oxidation occurs at the cathode |
| B. | Electrons move into the cathode |
| C. | Usually denoted by a negative sign |
| D. | Is usually made up of insulating material |
| Answer» C. Usually denoted by a negative sign | |
| 15. |
An electrochemical cell can only convert electrical energy to chemical energy. |
| A. | True |
| B. | False |
| Answer» C. | |