Which of the following is paramagnetic?

Step-by-step solution

Number of e - CO = 14 ,   NO + = 14 O 2 2 - = 18 ,     B 2 = 10 . According to MOT , CO : −   σ 1 s 2 < σ * 1 s 2 < σ 2 s 2 < σ * 2 s 2 < π 2 p x 2 = π 2 p y 2 < σ 2 p z 2 no unpaired e - so diamagnetic B 2 : −   σ 1 s 2 < σ * 1 s 2 < σ 2 s 2 < σ * 2 s 2 < π 2 p x 1 = π 2 p y 1 2 unpaired e - ,so paramagnetic O 2 − 2 : −   σ 1 s 2 < σ * 1 s 2 &#6