In the extraction of copper,its sulphide ore is heated in a reverberatory furnace after mixing with silica to:

  • A
    separate $CuO$ as $CuSiO_3$
  • B
    remove calcium as $CaSiO_3$
  • C
    decrease the temperature needed for roasting of $Cu_2S$
  • D
    remove $FeO$ as $FeSiO_3$

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