Question

Blister copper is:

• A. Impure Cu
• B. Cu alloy
• C. Pure Cu
• D. Cu having 1\% impurity

Hint:

Blister copper contains about 98-99\% copper with minor impurities and is further purified by electrorefining.

Answer 1

The Correct Option is D

Step 1: Understanding blister copper. 
- Blister copper is the intermediate product in the extraction of copper. 
- It is obtained after the Bessemerization process, where molten copper is oxidized to remove iron and sulfur impurities. 
Step 2: Composition of blister copper. 
- It contains about 98-99\% pure copper with 1-2\% impurities like oxygen and sulfur. 
- The name "blister copper" comes from the blisters formed due to escaping sulfur dioxide (\( SO_2 \)) gas. 
Step 3: Identifying the correct answer. 
- Since blister copper has 1\% impurity, the correct option is (D).