Which of the oxide groups among the following cannot be reduced by carbon?

  • A
    $Cu_2O, SnO_2$
  • B
    $CaO, K_2O$
  • C
    $PbO, Fe_3O_4$
  • D
    $Fe_2O_3, ZnO$

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

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