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Which one of the following nitrogen oxides may dimerize?

Options

  1. AN₂O
  2. BNO₂
  3. CN₂O₃
  4. DN₂O₅

Correct answer

B. NO₂

Step-by-step solution

Nitrogen dioxide ( NO₂ ) is an odd-electron molecule containing 17 valence electrons. Due to the presence of an unpaired electron on the nitrogen atom, it is highly reactive and paramagnetic. To achieve stability by pairing the odd electron, NO₂ undergoes dimerization to form dinitrogen tetroxide ( N₂O₄ ), which is a diamagnetic and even-electron molecule. 2NO₂ N₂O₄ The other oxides ( N₂O , N₂O₃ , N₂O₅ ) are even-electron molecules and do not dimerize. Answer: NO₂

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