In which of the reaction,oxygen is an oxidant.

Options

A. `2F_(2)+O_(2)to2F_(2)O`
B. `C+O_(2)toCO_(2)`
C. `2C+O_(2)to2CO`
D. `2N_(2)+O_(2)to2N_(2)O`

Answer

To determine in which reaction oxygen acts as an oxidant, we need to analyze the oxidation states of oxygen and other elements involved in the given reactions. An oxidant is a substance that gains electrons (is reduced) while causing another substance to be oxidized.

### Step-by-Step Solution:

1. **Identify the Reactions**: We have four different reactions to analyze. We need to look at the oxidation states of oxygen and the other reactants in each reaction.

2. **Analyze Reaction 1**:
- **Reactants**: Chlorine (Cl) and Oxygen (O) both in 0 oxidation state.
- **Products**: Chlorine in -1 oxidation state and Oxygen in +2 oxidation state.
- **Change in Oxidation State**:
- Chlorine: 0 to -1 (reduced)
- Oxygen: 0 to +2 (oxidized)
- **Conclusion**: Oxygen is oxidized, so it is **not** an oxidant in this reaction.

3. **Analyze Reaction 2**:
- **Reactants**: Carbon (C) and Oxygen (O) both in 0 oxidation state.
- **Products**: Carbon in +2 oxidation state and Oxygen in -2 oxidation state.
- **Change in Oxidation State**:
- Carbon: 0 to +2 (oxidized)
- Oxygen: 0 to -2 (reduced)
- **Conclusion**: Oxygen is reduced, so it **is** an oxidant in this reaction.

4. **Analyze Reaction 3**:
- **Reactants**: Carbon (C) and Oxygen (O) both in 0 oxidation state.
- **Products**: Carbon in +2 oxidation state and Oxygen in -2 oxidation state.
- **Change in Oxidation State**:
- Carbon: 0 to +2 (oxidized)
- Oxygen: 0 to -2 (reduced)
- **Conclusion**: Oxygen is reduced, so it **is** an oxidant in this reaction.

5. **Analyze Reaction 4**:
- **Reactants**: Nitrogen (N) and Oxygen (O) both in 0 oxidation state.
- **Products**: Nitrogen in +1 oxidation state and Oxygen in -2 oxidation state.
- **Change in Oxidation State**:
- Nitrogen: 0 to +1 (oxidized)
- Oxygen: 0 to -2 (reduced)
- **Conclusion**: Oxygen is reduced, so it **is** an oxidant in this reaction.

6. **Final Conclusion**:
- In summary, oxygen acts as an oxidant in reactions 2, 3, and 4.

### Summary of Results:
- Oxygen is an oxidant in reactions **2, 3, and 4**.