Blister copper obtained during extraction from cuprous oxide is called so because

Options

A. it has blister like eruptions due to evolution of gas.
B. it has a shining surface like blister
C. it is the most impure form of copper
D. its surface is uneven due to different thickness at different places.

Explanation

To answer the question about why blister copper is called so, we can break it down into several steps:

### Step-by-Step Solution:

1. **Understanding Blister Copper**:
- Blister copper is a form of copper that is produced during the extraction process from cuprous oxide (Cu2O).

2. **Extraction Process**:
- In the extraction of copper, cuprous oxide is partially oxidized. The chemical reactions involved lead to the formation of molten copper and the release of gases.

3. **Gas Evolution**:
- During the extraction, sulfur dioxide (SO2) gas is released as a byproduct. This gas escapes from the molten copper.

4. **Formation of Blisters**:
- As the SO2 gas escapes, it creates blister-like eruptions on the surface of the molten copper. These eruptions are essentially gas pockets that form as the gas tries to escape.

5. **Conclusion**:
- Therefore, blister copper is called so because it has blister-like eruptions due to the evolution of gas (specifically, sulfur dioxide) during the extraction process.

### Final Answer:
Blister copper obtained during extraction from cuprous oxide is called so because it has blister-like eruptions due to the evolution of gas.

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