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Q.

The slag formed during the Bessemer process in the extraction of copper is

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a

FeSiO3

b

MgSiO3

c

Ca3(PO4)2

d

CaSiO3

answer is A.

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Detailed Solution

  • Copper is mainly extracted from copper pyrites. 
  • After the concentration of its ore by froth flotation process, the ore is roasted in a current of air to remove arsenic, antimony and much of sulphur.
  • The ore is then mixed with a little coke and sand and smelted in a water-jacketed blast furnace. 
  • The minor reactions that occurred during roasting continue here. 
  • Ferrous oxide combines with sand to form a fusible slag.
  • FeO+SiO2 ​→ FeSiO3​ slag
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