Main ore of lead is galena.This is mined and separated from other minerals by froth flotation.There are two methods of extracting the lead.
(i)First method involves the roasting of ore followed by reduction
with coke or CO.
(ii)Second method involves the partial roasting of ore followed by
self reduction.
Partial roasting of galena gives :

Options

A. only PbS
B. only PbO
C. PbS+PbO
D. PbO+Pb

Explanation

To solve the question regarding the partial roasting of galena (PbS), we will break down the process step by step.

### Step-by-Step Solution:

1. **Identify the Main Ore**:
- The main ore of lead is galena, which is chemically represented as PbS (lead sulfide).

2. **Understand the Process of Partial Roasting**:
- Partial roasting of galena involves heating the ore in the presence of limited oxygen. This process does not fully convert all the PbS into PbO (lead oxide) but allows some of it to remain as PbS.

3. **Write the Reaction for Partial Roasting**:
- The balanced chemical reaction for the partial roasting of galena can be represented as:
\[ 3 \text{PbS} + 3 \text{O}_2 \rightarrow 2 \text{PbO} + \text{PbS} + 2 \text{SO}_2 \]
- In this reaction, some PbS is converted to PbO, while some remains as PbS.

4. **Identify the Products of Partial Roasting**:
- From the reaction, we can see that the products include:
- Lead sulfide (PbS)
- Lead oxide (PbO)
- Sulfur dioxide (SO₂)

5. **Conclusion**:
- Therefore, the result of the partial roasting of galena is the formation of both PbS and PbO.

### Final Answer:
The partial roasting of galena gives both PbS and PbO.

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