13) Which of the following chemical equations show oxidation-reduction reactions? Ca+12→→ Cal₂ Pb(ClO4)2 +2KI → Pbl₂ + 2KC104 Fe + 3CO2 Fe2O3+3CO2 1 and 2 1 and 3 2 only 2 and 3

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## Oxidation-Reduction Reactions

### Question 13

Which of the following chemical equations show oxidation-reduction reactions?

1. \( \text{Ca} + \text{I}_2 \rightarrow \text{CaI}_2 \)
2. \( \text{Pb(ClO}_4\text{)}_2 + 2\text{KI} \rightarrow \text{PbI}_2 + 2\text{KClO}_4 \)
3. \( \text{Fe}_2\text{O}_3 + 3\text{CO} \rightarrow 2\text{Fe} + 3\text{CO}_2 \)

**Options:**
- 1 and 2
- 1 and 3
- 2 only
- 2 and 3

### Analysis

Review each reaction to determine if there is a transfer of electrons, characterizing it as an oxidation-reduction (redox) reaction.

1. **Reaction 1:**
   - Calcium (\( \text{Ca} \)) is oxidized, and iodine (\( \text{I}_2 \)) is reduced, indicating a redox reaction.

2. **Reaction 2:**
   - There is no change in oxidation states between reactants and products, indicating it is not a redox reaction.

3. **Reaction 3:**
   - Iron (\( \text{Fe}_2\text{O}_3 \)) is reduced, and carbon monoxide (\( \text{CO} \)) is oxidized, indicating a redox reaction.

Thus, reactions 1 and 3 are oxidation-reduction reactions.
Transcribed Image Text:## Oxidation-Reduction Reactions ### Question 13 Which of the following chemical equations show oxidation-reduction reactions? 1. \( \text{Ca} + \text{I}_2 \rightarrow \text{CaI}_2 \) 2. \( \text{Pb(ClO}_4\text{)}_2 + 2\text{KI} \rightarrow \text{PbI}_2 + 2\text{KClO}_4 \) 3. \( \text{Fe}_2\text{O}_3 + 3\text{CO} \rightarrow 2\text{Fe} + 3\text{CO}_2 \) **Options:** - 1 and 2 - 1 and 3 - 2 only - 2 and 3 ### Analysis Review each reaction to determine if there is a transfer of electrons, characterizing it as an oxidation-reduction (redox) reaction. 1. **Reaction 1:** - Calcium (\( \text{Ca} \)) is oxidized, and iodine (\( \text{I}_2 \)) is reduced, indicating a redox reaction. 2. **Reaction 2:** - There is no change in oxidation states between reactants and products, indicating it is not a redox reaction. 3. **Reaction 3:** - Iron (\( \text{Fe}_2\text{O}_3 \)) is reduced, and carbon monoxide (\( \text{CO} \)) is oxidized, indicating a redox reaction. Thus, reactions 1 and 3 are oxidation-reduction reactions.
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