In the extraction of copper from its sulphide ore,the metal is formed by reduction of $Cu_2O$ with

  • A
    $FeS$
  • B
    $CO$
  • C
    $Cu_2S$
  • D
    $SO_2$

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Aluminium has a great affinity for oxygen and its oxidation is an exothermic process. This fact is made use of in

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