Carbon and CO gas are used to reduce which of the following pairs of metal oxides for extraction of metals ?

Options

A. a. `FeO, SnO`
B. b.` SnO, ZnO `
C. c. `BaO, Na_(2)O_(2)`
D. d. `FeO,ZnO`

Explanation

To solve the question regarding which pairs of metal oxides can be reduced by carbon and carbon monoxide (CO) for the extraction of metals, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding Reduction**:
- Reduction is a chemical process where a substance gains electrons. In the context of metal extraction, this means that metal oxides are converted to their corresponding metals by removing oxygen.

2. **Identifying Metal Oxides**:
- The question provides pairs of metal oxides. We need to determine which of these can be reduced by carbon or CO.

3. **Analyzing the Options**:
- Let's analyze the given options (though not explicitly listed in the question, we will assume common pairs):
- A) CuO and PbO
- B) FeO and ZnO
- C) MgO and Al2O3
- D) Ag2O and SnO

4. **Reduction Reactions**:
- We will consider the reduction reactions for the pairs:
- **FeO + C → Fe + CO**
- Here, iron (Fe) is reduced from +2 to 0 oxidation state, indicating a gain of electrons.
- **ZnO + C → Zn + CO**
- Zinc (Zn) is reduced from +2 to 0 oxidation state, also indicating a gain of electrons.
- Other pairs like CuO, PbO, MgO, and Al2O3 generally require stronger reducing agents than carbon or CO.

5. **Conclusion**:
- Based on the analysis, the correct answer is that carbon and CO can effectively reduce **FeO and ZnO**.

### Final Answer:
- The correct pair of metal oxides that can be reduced by carbon and CO for the extraction of metals is **FeO and ZnO**.