In the Haber process for the manufacture of $NH_3$,which of the following is true?

  • A
    $Mo$ acts as a catalyst and $Fe$ acts as a promoter.
  • B
    $Fe$ acts as a catalyst and $Mo$ acts as a promoter.
  • C
    $Fe$ acts as an inhibitor and $Mo$ acts as a catalyst.
  • D
    $Fe$ acts as a promoter and $Mo$ acts as an autocatalyst.

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