$2CuFeS_2 + O_2 \rightarrow Cu_2S + 2FeS + SO_2$
Which process of metallurgy of copper is represented by the above equation?

  • A
    Concentration
  • B
    Roasting
  • C
    Reduction
  • D
    Purification

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Select the process in which $SO_2$ is $NOT$ evolved:

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