JAMB Chemistry 2019 Objective — Question 16

Question 16 of 40 from the Joint Admissions and Matriculation Board (JAMB) Chemistry 2019 Objective paper, with the correct answer and a full explanation.

During the electrolysis of molten sodium chloride,

A. Chloride atom gains an electron
B. chloride ion gains an electron
C. chloride ion is oxidizedCorrect
D. Sodium ion is oxidized

Explanation

During electrolysis of molten NaCl, sodium ions migrate to the cathode, gain electrons (reduction) and are deposited as sodium metal. Chloride ions migrate to the anode, lose electrons (oxidation) and are liberated as chlorine gas: 2Cl⁻ − 2e⁻ → Cl₂. Oxidation occurs at the anode; reduction occurs at the cathode.

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