Which of the following is true in the case of Zn-Cu cell ?
Correct answer: C. Zinc acts as an anode and copper as cathode
- A. The flow of electrons takes place from copper to zinc
- B. E0red of copper electrode is less than that of zinc electrode
- C. Zinc acts as an anode and copper as cathode
- D. All are correct
Explanation
In a Zn-Cu galvanic cell, zinc is oxidised at the anode and copper ions are reduced at the cathode, so zinc is the anode and copper is the cathode. Electrons therefore flow from zinc to copper, and Cu has the more positive standard reduction potential. The likely wrong choice is electron flow from copper to zinc, which reverses the direction of electron flow.
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About Redox Reactions
Redox reactions involve oxidation and reduction occurring together, with electrons transferred between species or oxidation numbers changing. The topic covers assigning oxidation states, identifying oxidizing and reducing agents, balancing redox equations by oxidation number or half-reaction methods, and connecting chemical changes with galvanic and electrolytic cells.
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