Dinitrogen and dioxygen,the main constituents of air,do not react with each other in the atmosphere to form oxides of nitrogen because:

  • A
    $N_{2}$ is unreactive under atmospheric conditions.
  • B
    Oxides of nitrogen are unstable.
  • C
    The reaction between them can only occur in the presence of a catalyst.
  • D
    The reaction is endothermic and requires a very high temperature.

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