Composition of air - class-VII

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Multiple Choice

Dinitrogen and dioxygen are main constituents of air, but these do not react with each other to form oxides of nitrogen because:

  1. the reaction is endothermic and requires very high temperature
  2. the reaction can be initiated only in presence of a catalyst
  3. oxides of nitrogen are unstable
  4. $N _{2}$ and $O _{2}$ are unreactive
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