Multiple Choice
Which of the following reactants is the best indicator that a chemical reaction is an oxidation-reduction (redox) reaction?
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6. Chemical Quantities & Aqueous Reactions
Redox Reactions
Multiple Choice
Which of the following reactions is classified as an oxidation-reduction (redox) reaction?
A
CaCO_3 → CaO + CO_2
B
2Na + Cl_2 → 2NaCl
C
AgNO_3 + NaCl → AgCl + NaNO_3
D
HCl + NaOH → NaCl + H_2O
Verified step by step guidance1
Step 1: Understand what an oxidation-reduction (redox) reaction is. A redox reaction involves the transfer of electrons between species, resulting in changes in oxidation states of elements.
Step 2: Analyze each reaction by assigning oxidation numbers to the elements involved to see if any element changes its oxidation state during the reaction.
Step 3: For the reaction \(\mathrm{CaCO_3 \rightarrow CaO + CO_2}\), check the oxidation states of calcium, carbon, and oxygen on both sides to determine if any changes occur.
Step 4: For the reaction \(\mathrm{2Na + Cl_2 \rightarrow 2NaCl}\), assign oxidation numbers to sodium and chlorine before and after the reaction to see if electron transfer occurs.
Step 5: For the reactions \(\mathrm{AgNO_3 + NaCl \rightarrow AgCl + NaNO_3}\) and \(\mathrm{HCl + NaOH \rightarrow NaCl + H_2O}\), verify if any oxidation states change, indicating redox, or if these are simply double displacement or acid-base neutralization reactions.
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