Multiple Choice
Given the redox reaction: Zn + Cu^{2+} → Zn^{2+} + Cu, which of the following correctly separates the reaction into its oxidation and reduction half-reactions?
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6. Chemical Quantities & Aqueous Reactions
Redox Reactions
Multiple Choice
Which of the following chemical reactions is an oxidation-reduction (redox) reaction?
A
B
C
D
Verified step by step guidance1
Identify what an oxidation-reduction (redox) reaction is: it involves the transfer of electrons between species, resulting in changes in oxidation states of elements.
Examine each reaction and assign oxidation numbers to the elements involved on both reactant and product sides.
For the first reaction (HCl + NaOH → NaCl + H₂O), check if any element changes its oxidation state. Typically, this is an acid-base neutralization with no change in oxidation states, so it is not a redox reaction.
For the second reaction (C₂H₆ → C₂H₄ + H₂), look for changes in oxidation states of carbon and hydrogen. The loss of hydrogen gas suggests oxidation of C₂H₆, indicating a redox process.
For the third reaction (BaCl₂ + Na₂SO₄ → BaSO₄ + 2 NaCl), this is a double displacement (precipitation) reaction with no change in oxidation states, so it is not redox.
For the fourth reaction (2 Mg + O₂ → 2 MgO), assign oxidation numbers: Mg goes from 0 to +2, and O goes from 0 to -2, showing electron transfer and confirming it as a redox reaction.
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