JAMB Chemistry 2021 Objective — Question 21

Question 21 of 41 from the Joint Admissions and Matriculation Board (JAMB) Chemistry 2021 Objective paper, with the correct answer and a full explanation.

Which of the following is not redox?

A. Fe²⁺ → Fe³⁺ + e⁻Correct
B. Zn + 2HCl → ZnCl₂ + H₂
C. 2Mg + O₂ → 2MgO
D. None

Explanation

A redox reaction requires BOTH oxidation AND reduction. Fe²⁺ → Fe³⁺ + e⁻ shows only oxidation (Fe²⁺ is oxidised to Fe³⁺). There is no corresponding reduction half-reaction shown.

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