The species in which the $\mathrm{N}$ atom is in a state of sp hybridization is :-
$\mathrm{NO}_{2}$
$\mathrm{NO}_{2}^{+}$
$\mathrm{NO}_{2}^{-}$
$\mathrm{NO}_{3}^{-}$
Correct Option: , 2
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