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Number of paramagnetic oxides among the following given oxides is ..... .
$\mathrm{Li}_{2} \mathrm{O}, \mathrm{CaO}, \mathrm{Na}_{2} \mathrm{O}_{2}, \mathrm{KO}_{2}, \mathrm{MgO}$ and $\mathrm{K}_{2} \mathrm{O}$
$1$
$2$
$3$
$0$
Solution
$\mathrm{Li}_{2} \mathrm{O} \quad \Rightarrow 2 \mathrm{Li}^{+}\quad\mathrm{O}^{2-}$
$\mathrm{MgO} \Rightarrow \mathrm{Mg}^{2+}\quad \mathrm{O}^{2-}$
$\mathrm{CaO} \quad \Rightarrow \mathrm{Ca}^{2+} \quad \mathrm{O}^{2-}$
$\mathrm{K}_{2} \mathrm{O} \Rightarrow 2 \mathrm{~K}^{+} \quad\mathrm{O}^{2-}$
$\mathrm{Na}_{2} \mathrm{O}_{2} \Rightarrow 2 \mathrm{Na}^{+} \quad \mathrm{O}_{2}^{2-}$
$\mathrm{KO}_{2} \quad \Rightarrow \mathrm{K}^{+} \quad \mathrm{O}_{2}^{-}$
$\mathrm{O}_{2}^{-} \Rightarrow$ Complete octet, diamagnetic
$\mathrm{O}^{2} \Rightarrow \sigma_{1 \mathrm{~s}}^{2} \sigma_{1 \mathrm{~s}}^{* 2} \sigma_{2 \mathrm{~s}}^{2} \sigma_{2 \mathrm{~s}}^{*_{2}} \sigma_{2 \mathrm{px}}^{2} \pi_{2 \mathrm{py}}^{2} \simeq \pi_{2 \mathrm{pz}}^{2} \pi_{2 \mathrm{py}}^{*_{2}} \simeq \pi_{2 \mathrm{pz}}^{*_{2}}(\mathrm{dia})$
$\mathrm{O}_{2}^{-} \Rightarrow \sigma_{1 \mathrm{~s}}^{2} \sigma_{1 \mathrm{~s}}^{*_{2}} \sigma_{2 \mathrm{~s}}^{2} \sigma_{2 \mathrm{~s}}^{* 2} \sigma_{2 \mathrm{px}}^{2} \pi_{2 \mathrm{py}}^{2} \simeq \pi_{2 \mathrm{p} z}^{2} \pi_{2 \mathrm{py}}^{*} \simeq \pi_{2 \mathrm{pz}}^{* 1}(\mathrm{para})$
