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Question:

Which of the following is paramagnetic?

CO

O₂⁻

CN⁻

NO⁺

Solution:

O₂⁻ has one unpaired electron. Hence, it is paramagnetic. MOT configurations of O₂⁻: (σ1s)²(σ1s)²(σ2s)²(σ2s)²(σ2pz)²(π2px = π2py)(π2px = π2p1y) Hence, the correct option is B.