$NH_3 + O_2 \xrightarrow[500 \ K]{Pt} A + H_2O$
$A + O_2 \to B$; $B + H_2O \to C + A$
$A, B$ and $C$ respectively are

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

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Reason : Phosphorus has lower electronegativity than nitrogen.

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