1. Tardigrade
  2. Question
  3. Chemistry
  4. Number of paramagnetic oxides among the following given oxides is Li 2 O , CaO , Na 2 O 2, KO 2, MgO and K 2 O

Question Error Report

Thank you for reporting, we will resolve it shortly

Back to Question

Q. Number of paramagnetic oxides among the following given oxides is __
$Li _{2} O , CaO , Na _{2} O _{2}, KO _{2}, MgO$ and $K _{2} O$

JEE MainJEE Main 2021Chemical Bonding and Molecular Structure

Solution:

$Li _{2} O \Rightarrow 2 Li ^{+} \,O ^{2-}$
$CaO \Rightarrow Ca ^{2+} \,O ^{2-}$
$Na _{2} O _{2} \Rightarrow 2 Na ^{+} \,O _{2}^{2-}$
$KO _{2} \Rightarrow K ^{+} \,O _{2}^{-}$
$MgO \Rightarrow Mg ^{2+} O ^{2-}$
$K _{2} O \Rightarrow 2 K ^{+} \,O ^{2-}$
$O _{2}^{-} \Rightarrow $ Complete octet, diamagnetic
$O ^{2-} \Rightarrow \sigma_{1 s }^{2} \sigma_{1 s }^{* 2} \sigma_{2 s }^{2} \sigma_{2 s }^{* 2} \sigma_{2 px }^{2} \pi_{2 py }^{2} \simeq \pi_{2 pz }^{2} \pi_{2 py }^{* 2} \simeq \pi_{2 pz }^{* 2}$ (dia)
$O _{2}^{-} \Rightarrow \sigma_{1 s }^{2} \sigma_{1 s }^{* 2} \sigma_{2 s }^{2} \sigma_{2 s }^{* 2} \sigma_{2 px }^{2} \pi_{2 py }^{2} \simeq \pi_{2 pz }^{2} \pi_{2 py }^{* 2} \simeq \pi_{2 pz }^{* 1}$ (para)