Which of the following statements is incorrect?

  • A
    $Fe$ is used as a catalyst in the Haber process for the synthesis of $NH_3$.
  • B
    Anhydrous $AlCl_3$ is used as a catalyst in the Friedel-Crafts reaction.
  • C
    $Fe$ is used as a catalyst in the hydrogenation of oils.
  • D
    $V_2O_5$ is used as a catalyst for the oxidation of $SO_2$ to $SO_3$.

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