Multiple Choice
Which balanced equation represents a redox reaction (i.e., involves a change in oxidation numbers)?
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6. Chemical Quantities & Aqueous Reactions
Redox Reactions
Multiple Choice
Which of the following chemical reactions is NOT an oxidation-reduction (redox) reaction?
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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 atoms.
For each reaction, assign oxidation numbers to all elements in the reactants and products to check if any element changes its oxidation state.
In the first reaction, \(\mathrm{H_2S + Cl_2 \rightarrow 2HCl + S}\), check the oxidation states of sulfur and chlorine to see if they change, indicating redox.
In the second reaction, \(\mathrm{Zn + Cu^{2+} \rightarrow Zn^{2+} + Cu}\), observe the oxidation states of zinc and copper ions to confirm electron transfer.
In the third reaction, \(\mathrm{2Mg + O_2 \rightarrow 2MgO}\), verify the oxidation states of magnesium and oxygen to confirm if oxidation and reduction occur.
Finally, analyze the reaction \(\mathrm{HCl + NaOH \rightarrow NaCl + H_2O}\) by assigning oxidation states; since no oxidation states change, this is not a redox reaction but an acid-base neutralization.
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