Multiple Choice
Which of the following best describes the key characteristic of an oxidation–reduction (redox) reaction?
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6. Chemical Quantities & Aqueous Reactions
Redox Reactions
Multiple Choice
In the redox reaction Zn + Cu^{2+} → Zn^{2+} + Cu, is the reaction shown an oxidation for zinc?
A
No, zinc is reduced because it gains electrons.
B
Yes, zinc is oxidized because it loses electrons.
C
Yes, copper is oxidized because it loses electrons.
D
No, copper is oxidized in this reaction.
Verified step by step guidance1
Identify the species undergoing oxidation and reduction by examining their changes in oxidation states during the reaction.
Write the oxidation states of zinc and copper before and after the reaction: Zn (0) and Cu^{2+} (+2) initially; Zn^{2+} (+2) and Cu (0) after the reaction.
Determine which element loses electrons (oxidation) and which gains electrons (reduction). Zinc goes from 0 to +2, indicating it loses 2 electrons, so it is oxidized.
Copper goes from +2 to 0, indicating it gains 2 electrons, so it is reduced.
Conclude that zinc is oxidized because it loses electrons, and copper is reduced because it gains electrons.
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