Commercial electrochemical cells Quiz
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5 questions, one answer each
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1. Which electrode reaction occurs at the negative electrode of a lithium cell as it supplies current?
- A. Li⁺ + CoO₂ + e⁻ → Li⁺[CoO₂]⁻
- B. Li → Li⁺ + e⁻
- C. Li⁺ + e⁻ → Li
- D. CoO₂ → Co + O₂
2. A cell has electrode potentials of +0.34 V and −1.25 V. What is its EMF?
- A. +0.91 V
- B. +1.59 V
- C. −1.59 V
- D. +2.84 V
3. Which statement about an alkaline hydrogen–oxygen fuel cell is correct?
- A. It must be recharged from the mains when empty
- B. Its only product is water, and fuel is fed in continuously
- C. Hydrogen is reduced at the positive electrode
- D. Its electrolyte is dilute acid
4. Why can a lead–acid cell be recharged?
- A. Its products are gases that escape
- B. The EMF is zero when it is flat
- C. Its electrode reactions are reversible and the solid products stay on the electrodes
- D. Its electrodes are made of inert platinum
5. Which is a benefit to society of rechargeable cells compared with non-rechargeable cells?
- A. They are reused many times, so less waste is produced
- B. They never contain toxic metals
- C. They have an EMF of zero
- D. They need no electrolyte