Post-UTME Chemistry 2019 Objective — Question 3
Question 3 of 20 from the Post-UTME Screening (Post-UTME) Chemistry 2019 Objective paper, with the correct answer and a full explanation.
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Use the figure below (electrolysis of molten sodium chloride, with electrodes labelled and Z marking one electrode) to answer this question. Z is the
- A. anode where the Cl- ions are oxidizedCorrect
- B. cathode where the Cl- ions are reduced
- C. anode where the Na+ ions are reduced
- D. cathode where the Na+ ions are oxidized
Explanation
In electrolysis of molten NaCl, oxidation (loss of electrons from Cl-) occurs at the anode, while reduction of Na+ occurs at the cathode; Z corresponds to the anode where Cl- ions are oxidized.
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