Which is true about Zn-Cu galvanic cell ?
Correct answer: D. Anode is negatively charged
- A. Reduction occurs at anode
- B. K+ ion transfer from salt bridge to left beaker of ZnSO4
- C. Oxidation occurs at cathode
- D. Anode is negatively charged
Explanation
In a Zn-Cu galvanic cell, zinc is oxidised at the anode: Zn -> Zn2+ + 2e-. Electrons leave the zinc electrode, making the anode negative, while reduction occurs at the copper cathode. Students may choose reduction at the anode by confusing a galvanic cell with the location of a particular half-reaction in another context.
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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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