In the extraction process of copper, the product obtained after carrying out the reactions
(i) 2Cu2S + 3O2 ® 2Cu2O + 2SO2
(ii) 2Cu2O + Cu2S ® 6Cu + SO2 is called
(1) Reduced copper         (2) Blister copper        (3) Copper matte         (4) Copper scrap

Answer: Option 2
Solution:
In the extraction process of copper, copper sulfide ores are first roasted to convert them into copper oxide and sulfur dioxide gas. The reaction is given as:
2Cu2S + 3O2 → 2Cu2O + 2SO2
The copper oxide is then reduced to copper metal using a reducing agent such as coke. However, the copper oxide is often mixed with impurities such as iron and sulfur, which can also be reduced along with the copper oxide. The reaction is given as:
2Cu2O + Cu2S → 6Cu + SO2
The product obtained after this reaction is called blister copper.
It is called blister copper because it has a blistered appearance due to the evolution of sulfur dioxide gas during the reduction process.

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