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During the extraction of copper , the im...

During the extraction of copper , the impurity (FeS) is removed as slag by mixing the contaminated copper ore with silica and coke. The molecular formula of slag is

A

`FeSiO_(3)`

B

`Fe_2O_3`

C

`FeSi`(solid)

D

FeSi(vapour)

Text Solution

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The correct Answer is:
A
Copper pyrite is roasted first and forms `Cu_2S` and `FeS`. In blast furnace in presence of air , it oxidises to `Cu_2O` and `FeO`. The impurity FeO reacts with sand (silica) to form slag. `FeO+SiO_2tounderset("Ferrous Silicate" ("slag"))(FeSiO_3)`
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