Question detail
Which of the following represents a reduction process?
Try the question, check the answer, then read the explanation to understand the curriculum point.
At a glance
MCQ
Type
practice
Style
Topic
Oxidation, reduction and redox equations
Question
- A. Fe^3+ + 3e^- → Fe
- B. Cu → Cu^2+ + 2e^-
- C. 2H^+ + 2e^- → H2
- D. Ag^+ + e^- → Ag
Answer
Fe^3+ + 3e^- → Fe
Explanation
The equation Fe^3+ + 3e^- → Fe shows a decrease in oxidation state as Fe^3+ gains electrons to become Fe.
Common mistake
Misunderstanding Reduction
Students often confuse reduction with an increase in oxidation state instead of a decrease.
Reduction is defined as a decrease in oxidation state. To clarify, remember that when an element gains electrons, its oxidation state decreases. For example, in the reaction where Fe^3+ gains an electron to become Fe^2+, the oxidation state decreases from +3 to +2, confirming that reduction has occurred.
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