$NH_3 + O_2 \xrightarrow[\Delta]{Pt} A + H_2O$ ;
$A + O_2 \to B$ ;
$B + O_2 + H_2O \to C$
$A, B$ and $C$ are:

  • A
    $N_2O, NO_2, HNO_3$
  • B
    $NO, NO_2, HNO_3$
  • C
    $NO_2, NO, HNO_3$
  • D
    $NO, N_2O, HNO_3$

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