In which of the following molecules/ions in the central atom $s{p}^2$-hybridized?

$\underset{\text{Planar structure}}{\underset{F}{\underset{\mid }{\stackrel{F}{\stackrel{\mid }{{.}^{\sigma }B}}}}\stackrel{\sigma }{-}F}\Rightarrow 3\sigma$-bonds , i.e. $s{p}^2$ hybridisation
$N{O}_2^{-}$
$O=:\ddot{N}{:}^{\theta }=O\Rightarrow 2\sigma$-bonds +1 lone pair of electrons, i.e. $s{p}^2$ hybridisation
$N{H}_2^{-}$
$H\stackrel{\sigma }{-}\underset{.x}{\ddot{N}}\stackrel{\sigma }{-}H\Rightarrow 2\sigma$-bonds +2 lone pairs, i.e. $s{p}^3$ hybridisation

$\Rightarrow 2\sigma$-bonds+2 lone pairs, i.e. $s{p}^3$ hybridisation Thus, in $B{F}_3$ and $N{O}_2^{-}$ central atom is $s{p}^2$ hybridised, while $N{H}_2,N{H}_3\text{and}{H}_{2}O$ are $s{p}^3$ hybridised.