In which of the following reactions is there a change in the oxidation number of the nitrogen atom?

  • A
    $2NO_2 \longrightarrow N_2O_4$
  • B
    $NH_3 + H_2O \longrightarrow NH_4^+ + OH^{-}$
  • C
    $N_2O_5 + H_2O \longrightarrow 2HNO_3$
  • D
    $N_2 + 3H_2 \longrightarrow 2NH_3$

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