4.Chemical Bonding and Molecular Structure
hard

નીચેના આપેલા ઓક્સાઈડ્સમાં પેરામેગ્નેટિક ઓક્સાઈડની સંખ્યા છે?

${Li}_{2} {O}, {CaO}, {Na}_{2} {O}_{2}, {KO}_{2}, {MgO}$ અને ${K}_{2} {O}$

A

$1$

B

$2$

C

$3$

D

$0$

(JEE MAIN-2021)

Solution

${Li}_{2} {O} \quad \Rightarrow 2 {Li}^{+}\quad{O}^{2-}$

${MgO} \Rightarrow {Mg}^{2+}\quad {O}^{2-}$

${CaO} \quad \Rightarrow {Ca}^{2+} \quad {O}^{2-}$

${K}_{2} {O} \Rightarrow 2 {~K}^{+} \quad{O}^{2-}$

${Na}_{2} {O}_{2} \Rightarrow 2 {Na}^{+} \quad {O}_{2}^{2-}$

${KO}_{2} \quad \Rightarrow {K}^{+} \quad {O}_{2}^{-}$

${O}_{2}^{-} \Rightarrow$ Complete octet, diamagnetic

${O}^{2} \Rightarrow \sigma_{1 {~s}}^{2} \sigma_{1 {~s}}^{* 2} \sigma_{2 {~s}}^{2} \sigma_{2 {~s}}^{*_{2}} \sigma_{2 {px}}^{2} \pi_{2 {py}}^{2} \simeq \pi_{2 {pz}}^{2} \pi_{2 {py}}^{*_{2}} \simeq \pi_{2 {pz}}^{*_{2}}({dia})$

${O}_{2}^{-} \Rightarrow \sigma_{1 {~s}}^{2} \sigma_{1 {~s}}^{*_{2}} \sigma_{2 {~s}}^{2} \sigma_{2 {~s}}^{* 2} \sigma_{2 {px}}^{2} \pi_{2 {py}}^{2} \simeq \pi_{2 {p} z}^{2} \pi_{2 {py}}^{*} \simeq \pi_{2 {pz}}^{* 1}({para})$

Standard 11
Chemistry

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