Which of the following is paramagnetic? [2019]

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Solution

Q.
Which of the following is paramagnetic [2019]

1 $N_{2}$

2 $H_{2}$

3 ${Li}_{2}$

4 $O_{2}$

Ans.
(4)

$N_{2} (14) : K K σ 2 s^{2} σ^{} 2 s^{2} π 2 p_{x}^{2} = π 2 p_{y}^{2} σ 2 p_{z}^{2};$ Diamagnetic

$H_{2} (2) : σ 1 s^{2}$ ; Diamagnetic

$L i_{2} (6) : σ 1 s^{2} σ^{} 1 s^{2} σ 2 s^{2};$ Diamagnetic

$O_{2} (16) : σ 1 s^{2} σ^{} 1 s^{2} σ 2 s^{2} σ^{} 2 s^{2} σ 2 p_{z}^{2} π 2 p_{x}^{2} = π 2 p_{y}^{2} π^{} 2 p_{x}^{1} = π^{} 2 p_{y}^{1};$ Paramagnetic

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