In which of the following pair(s) the minerals are converted in to
metals by self-reduction process?

Options

A. `Cu_2S, PbS`
B. PbS, HgS
C. PbS, ZnS
D. `Ag_2S, Cu_2S`

Explanation

To determine which pairs of minerals are converted into metals by the self-reduction process, we need to analyze the minerals provided in the question. The self-reduction process is typically used for sulfide ores of less electropositive metals, such as copper, lead, and mercury.

### Step-by-Step Solution:

1. **Identify the Metals in the Question**:
- We need to look for pairs of minerals that contain less electropositive metals. The common examples include:
- Copper (Cu)
- Lead (Pb)
- Mercury (Hg)

2. **Analyze the Given Pairs**:
- **Pair 1: Copper Sulfide (Cu₂S)**:
- The self-reduction reaction for copper sulfide is:
\[ 2Cu_2S + 3O_2 \rightarrow 2Cu_2O + 2SO_2 \]
\[ 2Cu_2O + Cu_2S \rightarrow 6Cu + SO_2 \]
- This shows that copper can be obtained from its sulfide by self-reduction.

- **Pair 2: Lead Sulfide (PbS)**:
- The self-reduction reaction for lead sulfide is:
\[ 2PbS + 3O_2 \rightarrow 2PbO + 2SO_2 \]
\[ 2PbO + PbS \rightarrow 3Pb + SO_2 \]
- This indicates that lead can also be obtained from its sulfide through self-reduction.

- **Pair 3: Zinc Sulfide (ZnS)**:
- Zinc sulfide is typically reduced to zinc using carbon reduction:
\[ ZnS + C \rightarrow Zn + CS_2 \]
- Therefore, zinc does not undergo self-reduction.

- **Pair 4: Silver Sulfide (Ag₂S)**:
- Silver is usually extracted through hydrometallurgy, not self-reduction.

3. **Conclusion**:
- The pairs that can be converted into metals by the self-reduction process are:
- Copper Sulfide (Cu₂S)
- Lead Sulfide (PbS)

### Final Answer:
The correct pairs of minerals that are converted into metals by the self-reduction process are:
- Copper Sulfide (Cu₂S)
- Lead Sulfide (PbS)