JEE Main 2021 — Chemistry Physical Chemistry

Species must not contain single unpaired

$${O}_{2}^{+}\rightarrow {\sigma }_{1s}^{2}<{\sigma }_{1s}^{*2}<{\sigma }_{2s}^{2}<{\sigma }_{2s}^{*2}<{\sigma }_{2\mathrm{pz}}^{2}<{\pi }_{2\mathrm{px}}^{2}={\pi }_{2\mathrm{py}}^{2}<{\pi }_{2\mathrm{px}}^{*1}={\pi }_{2\mathrm{py}}^{*0}$$O2+​→σ1s2​<σ1s∗2​<σ2s2​<σ2s∗2​<σ2pz2​<π2px2​=π2py2​<π2px∗1​=π2py∗0​

unpaired ${e}^{-}=1\therefore \mu =1.73\mathrm{BM}$e−=1∴μ=1.73BM

(1) ${\mathrm{Cu}}^{+}{I}^{-}{\mathrm{Cu}}^{+}\rightarrow [\mathrm{Ar}]3{d}^{10}\therefore$Cu+I−Cu+→[Ar]3d10∴ unpaired ${e}^{-}=0$e−=0

${I}^{-}\rightarrow [\mathrm{Xe}]\therefore$I−→[Xe]∴ unpaired ${e}^{-}=0$e−=0

therefore $\mu =0$μ=0

$$3.[\mathrm{Cu}{({\mathrm{NH}}_{3})}_{4}]{\mathrm{Cl}}_{2}$$3.[Cu(NH3​)4​]Cl2​

$\mathrm{Cu}\rightarrow [A]3{d}^{3}\therefore$Cu→[A]3d3∴ unpaired $=1\therefore \mu =1.73\mathrm{BM}$=1∴μ=1.73BM

$$4.{O}_{2}^{-}\rightarrow d$$4.O2−​→d

$${\sigma }_{1s}^{2}<{\sigma }_{1s}^{{*}_{2}}<{\sigma }_{2s}^{2}<{\sigma }_{2s}^{*2}<{\sigma }_{2\mathrm{pz}}^{2}<{\pi }_{2\mathrm{px}}^{2}={\pi }_{2\mathrm{py}}^{2}<{\pi }_{2\mathrm{px}}^{*2}={\pi }_{2\mathrm{py}}^{*1}$$σ1s2​<σ1s∗2​​<σ2s2​<σ2s∗2​<σ2pz2​<π2px2​=π2py2​<π2px∗2​=π2py∗1​

1 Unpaired electron

$\therefore$∴ unpaired $\therefore \mu =1.73\mathrm{BM}$∴μ=1.73BM