Multiple Choice
In the redox reaction Zn + Cu^{2+} → Zn^{2+} + Cu, is the reaction shown an oxidation for zinc?
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6. Chemical Quantities & Aqueous Reactions
Redox Reactions
Multiple Choice
Which of the following half-reactions represents a reduction process?
A
Fe^{2+} ightarrow Fe^{3+} + e^-
B
Zn ightarrow Zn^{2+} + 2e^-
C
Cl_2 ightarrow 2Cl^-
D
Cu^{2+} + 2e^- ightarrow Cu
Verified step by step guidance1
Understand that a reduction process involves the gain of electrons by a species. In half-reactions, electrons appear on the reactant side for reduction.
Examine each half-reaction to identify where electrons are on the reactant side, indicating reduction:
- For \(Fe^{2+} \rightarrow Fe^{3+} + e^-\), electrons are produced on the product side, indicating oxidation.
- For \(Zn \rightarrow Zn^{2+} + 2e^-\), electrons are also on the product side, indicating oxidation.
- For \(Cl_2 \rightarrow 2Cl^-\), electrons are not explicitly shown, but since chlorine is going from elemental form to ions, it gains electrons (reduction). The correct reduction half-reaction explicitly shows electrons on the reactant side, such as \(Cu^{2+} + 2e^- \rightarrow Cu\).
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