At room temperature,the reaction between $NO$ and $O_2$ to form $NO_2$ is fast,whereas the reaction between $CO$ and $O_2$ is slow because:

  • A
    The size of $CO$ is smaller than $NO$.
  • B
    $CO$ is toxic.
  • C
    The activation energy for $2NO + O_2 \rightarrow 2NO_2$ is lower than that for $2CO + O_2 \rightarrow 2CO_2$.
  • D
    None of the above.

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