Which ion will discharge first at the cathode during electrolysis of aqueous NaCl?
Correct answer: B. H⁺
- A. Na⁺
- B. H⁺
- C. Cl⁻
- D. OH⁻
Explanation
In aqueous solutions, H⁺ is reduced more easily than Na⁺. So H⁺ → H₂ is produced at cathode.
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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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