The chemical composition of 'slag' formed during the smelting process in the extraction of copper is :
Correct answer: B. FeSiO3
- A. Cu2O + FeS
- B. FeSiO3
- C. CuFeS2
- D. Cu2S + FeO
Explanation
In the extraction of copper from its ores, iron is a common impurity that needs to be removed during the smelting process. This is achieved by adding silica (SiO2) to the smelt, which reacts with iron sulfide (FeS) present in the ore. The reaction between FeS and SiO2 forms ferrous silicate (FeSiO3), which is the slag that is removed. This slag formation helps in purifying the copper by separating out the iron impurities. Other options, such as Cu2O, CuFeS2, and Cu2S + FeO, do not accurately describe the composition of the slag or are not relevant to the slag formation process.
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