Which one of the following nitrogen oxides may dimerize?

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NDA-I (GAT) Official Paper (Held On: 13 Apr, 2025)
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  1. N₂O
  2. NO₂
  3. N₂O₃
  4. N₂O₅

Answer (Detailed Solution Below)

Option 2 : NO₂
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Detailed Solution

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CONCEPT:

Dimerization of Nitrogen Oxides

  • Some nitrogen oxides can undergo dimerization under specific conditions to form stable dimers.
  • Dimerization usually occurs when the monomer has an unpaired electron or is a free radical. This allows the molecules to pair up and stabilize by forming a covalent bond or through other interactions.

EXPLANATION:

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  • NO₂ (Nitrogen dioxide): This molecule has an unpaired electron, making it a free radical. As a result, it can dimerize to form N₂O₄ (dinitrogen tetroxide) under suitable conditions, such as low temperatures.

Therefore, the nitrogen oxide that may dimerize is NO₂.

Reaction for dimerization of NO₂:

2NO₂ → N₂O₄

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