Which one of the following is not paramagnetic?

Question

Which one of the following is not paramagnetic? (A) NO (B) N2+ (C) CO (D) O-2

Tardigrade Admin · Accepted Answer

Paramagnetic character is shown by those atoms or molecules which have unpaired electrons.
In the given molecules CO is not paramagnetic, since, it does not have unpaired electrons. The configuration of

CO

molecule is

CO (14) = σ 1 s^{2}, σ * 1 s^{2}, σ 2 s^{2}, σ * 2 s^{2}, π 2 p_{x}^{2} \approx

π 2 p_{y}^{2}, σ 2 p_{z}^{2}

Q. Which one of the following is not paramagnetic?

$NO$

$N_{2}^{+}$

$CO$

$O_{2}^{-}$

Q. Which one of the following is not paramagnetic?

NO

N2+​

CO

O2−​

Paramagnetic character is shown by those atoms or molecules which have unpaired electrons. In the given molecules CO is not paramagnetic, since, it does not have unpaired electrons. The configuration of CO molecule is CO(14)=σ1s2,σ∗1s2,σ2s2,σ∗2s2,π2px2​≈ π2py2​,σ2pz2​

$NO$

$N_{2}^{+}$

$CO$

$O_{2}^{-}$