Answers and explanations for all the above questions:
1. B. Loss of electrons
Explanation: Oxidation is the loss of electrons by a molecule, atom, or ion.
2. A. Gain of electrons
Explanation: Reduction is the gain of electrons by a molecule, atom, or ion.
3. C. Both mass and charge
Explanation: Balancing oxidation-reduction reactions requires balancing both mass and charge to ensure the conservation of atoms and charge.
4. D. Produce chemical reactions through electricity
Explanation: Electrolytic cells use electricity to induce non-spontaneous chemical reactions.
5. B. Some ions being discharged preferentially over others
Explanation: Preferential discharge in electrolysis refers to certain ions being preferentially discharged at the electrodes.
6. D. Ions in a solution
Explanation: Electrolysis of aqueous solutions involves the decomposition of ions present in the solution.
7. A. Current passing through the cell
Explanation: Faraday's First Law states that the amount of substance produced is directly proportional to the quantity of electricity passed through the cell.
8. A. The charge passed through the cell
Explanation: Faraday's Second Law states that the amount of substance produced is directly proportional to the quantity of electricity passed through the cell.
9. B. Manufacturing chemicals
Explanation: Industrial applications of electrolysis include the production of various chemicals through electrolytic processes.
10. A. Chemical reactions
Explanation: Voltaic cells generate electricity through spontaneous chemical reactions.
11. B. Loss of oxygen
Explanation: Oxidation involves the loss of electrons, not the gain or loss of oxygen.
12. A. Gain of electrons
Explanation: Reduction involves the gain of electrons, not the loss.
13. D. Ions
Explanation: Electrolysis of aqueous solutions results in the decomposition of ions present in the solution.
14. A. The charge passed through the cell
Explanation: Faraday's First Law relates the amount of substance produced to the quantity of electricity passed through the cell.
15. A. The charge passed through the cell
Explanation: Faraday's Second Law correlates the amount of substance produced to the quantity of electricity passed through the cell.
16. B. Electricity
Explanation: Industrial applications of electrolysis include the production of electricity through electrochemical processes.
17. A. Chemical reactions
Explanation: Voltaic cells generate electricity through spontaneous chemical reactions that occur at the electrodes.
18. B. Loss of electrons
Explanation: Oxidation involves the loss of electrons by a species.
19. A. Gain of electrons
Explanation: Reduction involves the gain of electrons by a species.
20. C. Both mass and charge
Explanation: Balancing oxidation-reduction reactions requires balancing both mass and charge to ensure the conservation of atoms and charge.
These explanations provide a deeper understanding of the concepts of oxidation, reduction, electrolysis, and voltaic cells covered in the Grade 12 Chemistry curriculum.
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1. B. Loss of electrons
Explanation: Oxidation is the loss of electrons by a molecule, atom, or ion.
2. A. Gain of electrons
Explanation: Reduction is the gain of electrons by a molecule, atom, or ion.
3. C. Both mass and charge
Explanation: Balancing oxidation-reduction reactions requires balancing both mass and charge to ensure the conservation of atoms and charge.
4. D. Produce chemical reactions through electricity
Explanation: Electrolytic cells use electricity to induce non-spontaneous chemical reactions.
5. B. Some ions being discharged preferentially over others
Explanation: Preferential discharge in electrolysis refers to certain ions being preferentially discharged at the electrodes.
6. D. Ions in a solution
Explanation: Electrolysis of aqueous solutions involves the decomposition of ions present in the solution.
7. A. Current passing through the cell
Explanation: Faraday's First Law states that the amount of substance produced is directly proportional to the quantity of electricity passed through the cell.
8. A. The charge passed through the cell
Explanation: Faraday's Second Law states that the amount of substance produced is directly proportional to the quantity of electricity passed through the cell.
9. B. Manufacturing chemicals
Explanation: Industrial applications of electrolysis include the production of various chemicals through electrolytic processes.
10. A. Chemical reactions
Explanation: Voltaic cells generate electricity through spontaneous chemical reactions.
11. B. Loss of oxygen
Explanation: Oxidation involves the loss of electrons, not the gain or loss of oxygen.
12. A. Gain of electrons
Explanation: Reduction involves the gain of electrons, not the loss.
13. D. Ions
Explanation: Electrolysis of aqueous solutions results in the decomposition of ions present in the solution.
14. A. The charge passed through the cell
Explanation: Faraday's First Law relates the amount of substance produced to the quantity of electricity passed through the cell.
15. A. The charge passed through the cell
Explanation: Faraday's Second Law correlates the amount of substance produced to the quantity of electricity passed through the cell.
16. B. Electricity
Explanation: Industrial applications of electrolysis include the production of electricity through electrochemical processes.
17. A. Chemical reactions
Explanation: Voltaic cells generate electricity through spontaneous chemical reactions that occur at the electrodes.
18. B. Loss of electrons
Explanation: Oxidation involves the loss of electrons by a species.
19. A. Gain of electrons
Explanation: Reduction involves the gain of electrons by a species.
20. C. Both mass and charge
Explanation: Balancing oxidation-reduction reactions requires balancing both mass and charge to ensure the conservation of atoms and charge.
These explanations provide a deeper understanding of the concepts of oxidation, reduction, electrolysis, and voltaic cells covered in the Grade 12 Chemistry curriculum.
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