In which of the following reactions, occur at cathode?
Correct answer: A. Cu^2+ + 2e^- → Cu
- A. Cu^2+ + 2e^- → Cu
- B. Cu+2e^- → Cu^2+
- C. Hg+O2 → HgO
- D. Mg+O2 → MgO
Explanation
This equation represents a reduction reaction where copper ions (Cu^2+) gain electrons (2e^-) to form solid copper (Cu). Such reduction reactions occur at the cathode during the electrolysis of a copper(II) salt solution.
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Electrochemistry describes electron transfer through oxidation and reduction, identifies oxidizing and reducing agents, and applies oxidation numbers to balance redox equations. It also covers electrode potential and the standard hydrogen electrode, which provides the reference for comparing the reduction tendencies of other electrodes.
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