- Home
- Standard 11
- Chemistry
The pairs of species of oxygen and their magnetic behaviour are noted below. Which of the following presents the correct description ?
$O_2^-, O_2^{2-}$ - Both diamagnetic
$O^+, O_2^{2-}$ - Both paramagnetic
$O_2^+ , O_2$ - Both paramagnetic
$O, O_2^{2-}$ - Both paramagnetic
Solution
$\mathrm{O}_{2}^{+}=\mathrm{KK} \sigma 2 \mathrm{s}^{2} \sigma^{*} 2 \mathrm{s}^{2} \sigma 2 \mathrm{pz}^{2}\left(\pi 2 \mathrm{px}^{2}=\pi 2 \mathrm{py}^{2}\right)\left(\pi^{*} 2 \mathrm{px}^{1}\right)$
$\mathrm{O}_{2}=\mathrm{KK} \sigma 2 \mathrm{s}^{2} \sigma^{*} 2 \mathrm{s}^{2} \sigma 2 \mathrm{pz}^{2}\left(\pi 2 \mathrm{px}^{2}=\pi 2 \mathrm{py}^{2}\right)\left(\pi^{*} 2 \mathrm{px}^{1}=\pi^{*} 2 \mathrm{py}^{1}\right)$
$\mathrm{O}_{2}$ and $\mathrm{O}_{2}^{+}$ contain unpaired electron in $\pi^{*}$ ABMO so paramagnetic.
