Which of the following has unpaired electron(s) ?

Question:

Which of the following has unpaired electron(s) ?

  1. $\mathrm{O}_{2}^{-}$

  2. $\mathrm{N}_{2}^{2+}$

  3. $\mathrm{O}_{2}^{2-}$

  4. $\mathrm{N}_{2}$


Correct Option: 1

Solution:

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