Multiple Choice
In the context of redox reactions, which term best describes a reduction process?
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6. Chemical Quantities & Aqueous Reactions
Redox Reactions
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Which half-reaction correctly represents a reduction process?
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Verified step by step guidance1
Understand that a reduction half-reaction involves the gain of electrons, meaning electrons appear on the reactant side and the species is reduced to a lower oxidation state or elemental form.
Examine the first half-reaction: \$2\,Cl^{-} \rightarrow Cl_{2} + 2e^{-}$. Here, chloride ions lose electrons to form chlorine gas, which is an oxidation process, not reduction.
Look at the second half-reaction: \(Z_{n} \rightarrow Z_{n}^{2+} + 2e^{-}\). This shows a neutral metal atom losing electrons to form a cation, which is oxidation, not reduction.
Consider the third half-reaction: \(Cu^{2+} + 2e^{-} \rightarrow Cu\). Here, copper ions gain electrons to form solid copper metal, which is a classic example of reduction.
Review the fourth half-reaction: \(H_{2} \rightarrow 2H^{+} + 2e^{-}\). Hydrogen gas loses electrons to form protons, indicating oxidation, not reduction.
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