$A$ certain reaction occurs in two steps as:
$(i)$ $2 SO_{2(g)} + 2 NO_{2(g)} \rightarrow 2 SO_{3(g)} + 2 NO_{(g)}$
$(ii)$ $2 NO_{(g)} + O_{2(g)} \rightarrow 2 NO_{2(g)}$
In the reaction,

  • A
    $NO_{2(g)}$ is intermediate
  • B
    $NO_{(g)}$ is intermediate
  • C
    $NO_{(g)}$ is catalyst
  • D
    $O_{2(g)}$ is intermediate

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