Question

Which of the following species is paramagnetic?

पर्याय

• \[\ce{NO-}\]

• \[\ce{O^{2-}_2}\]

• \[\ce{CN-}\]

• Co

Answer 1

\[\ce{NO-}\]

Explanation:

Number of electrons in NO^- = 7 + 8 + 1 = 16

So, the molecular orbital electronic configuration of NO^- is, σ1s² σ^•1s² σ2s² σ^•2s²  `sigma2"p"_"z"^2 pi  2"p"_x^2 = 2p_y^2 pi^• 2p_x^1 = pi^• 2p_y^1`

Hence, it is paramagnetic.due to-presence of unpaired electron in `pi^• 2P_x` and `pi^•2P_y` orbitals.