Which of the following molecule is paramagnetic

Chlorine

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Nitrogen

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Oxygen

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Hydrogen

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Solution

The correct option is C
Oxygen

Oxygen is paramagnetic due to the presence of two unpaired electron :

$O_{2} = σ (1 s)^{2} σ^{∙} (1 s)^{2} σ (2 s)^{2} σ^{∙} (2 s)^{2} σ (2 p_{z})^{2} π (2 p_{y})^{2} π (2 p_{x})^{2} π^{∙} (2 p_{y})^{1} π^{∙} (2 p_{z})^{1}$

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Oxygen molecule is paramagnetic because

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