Which of the followoing species are paramagnetic in nature?

F_{2}

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O F

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N O

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B_{2}

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Solution

The correct options are
B $O F$
C $N O$
D $B_{2}$
The pressure of unpaired electrons leads to paramagnetic nature of substances.
Species having odd no. of electrons are definitely paramagnetic but the ones with even no. of electrons are not definitely diamagnetic thus requires work.
$F_{2} - 18 O F - 17 N O - 15 B_{2} - 10$
$\Rightarrow O F$ and $N O$ are definitely paramagnetic
$F_{2}$ & $B_{2}$ are to be checked.
$F_{2} - 18$
Configuration:- $σ_{1 s^{2}}, σ_{1 s^{2}}^{}, σ_{2 s^{2}}, σ_{2 s^{2}}^{}, σ_{2 p_{z}^{2}}, (π_{2 p_{x}^{2}} π_{2 p_{y}^{2}}), (π_{2 p_{x}^{2}}^{} π_{2 p_{y}^{2}}^{})$
$\Rightarrow$ Diamagnetic
$B_{2} - 10$
Configuration: $σ_{1 s^{2}}, σ_{1 s^{2}}^{}, σ_{2 s^{2}}, σ_{2 s^{2}}^{}, σ_{2 p_{z}^{2}}, (π_{2 p_{x}^{1}} π_{2 p_{y}^{1}})$
$\Rightarrow$ Paramagnetic
Hence, Out of the given species, $O F, N O$ and $B_{2}$ are paramagnetic

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Among the following the total no. of species which are paramagnetic

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