NEET Questions Solved

NEET - 2013

Which of the following is paramagnetic?

(a) CO                (b) O2-

(c) CN              (d) NO+

(b) Paramagnetic species contains unpaired electrons in their molecular orbital electronic configuration. Molecular orbital configuration of the given species is given as

  CO (6+8=14) = σ1s2, σ*1s2, σ2s2, σ*2s2, π2px2π2py2, σ2pz2

(All the electrons are paired so it is diamagnetic)

 O2-(8+8+1=17) = σ1s2, σ*1s2, σ2s2, σ*2s2,σ2pz2, π2px2π2py2, π*2px2π*2py1





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