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During the extraction of copper in a blast furnace, which of the following reactions occurs?

1. 2Cu2S + 3O2 → 2Cu2O + 2SO2
2. 2FeS + 3O2 → 2FeO + 2SO2
3. 2Cu2O + Cu2S → 6Cu + SO2
4. All of the above

Correct answer: All of the above

Solution

In the smelting/bessemerization of copper all three reactions take place: roasting 2Cu2S+3O2->2Cu2O+2SO2, oxidation of the iron sulphide impurity 2FeS+3O2->2FeO+2SO2, and the self-reduction 2Cu2O+Cu2S->6Cu+SO2. Hence the correct choice is 'All of the above'.

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