Question

$N_2$ and $O_2$ are converted into mono anions, $N_2^{-}$ and $O_2^{-}$ respectively. Which of the following statements is wrong ?

• A. In $N_2$, the N?N bond weakens
• B. In $O_2$, the O?O bond order increases
• C. In $O_2$, bond length decreases
• D. $N_2^{-}$ becomes diamagnetic

Answer 1

Answer: (D)

$N_2^{-}$ becomes diamagnetic

Answer 2

In $N_{2}^{-}$ total electrons $=14+1=15$ Electronic configuration of $N_{2}^{-} \sigma 1 s^{2}, \hat{\sigma} 1 s^{2}, \sigma 2 s^{2}, \widehat{\sigma} 2 s^{2}, \sigma 2 p_{x}^{2}, \pi 2 p_{y}^{2} \approx \pi 2 p_{z}^{2}, \star{\pi} 2 p_{z}^{1}$
Due to presence of one unpaired electron, it shows paramagnetic character.