Question

Two of the following species have the same shape-
$N{I}_3$ , $I_3^{-}$, $S{O}_3^{-2}$, $N{O}_3^{-}$. These species are-

• A. $N{I}_3$ , $I_3^{-}$
• B. $N{I}_3$ , $S{O}_3^{-2}$
• C. $S{O}_3^{-2}$, $N{O}_3^{-}$
• D. $I_3^{-}$ , $N{O}_3^{-}$

Answer 1

The correct option is B $N{I}_3$ , $S{O}_3^{-2}$

$N{I}_3$ has $s{p}^3$ hybridisation and one lone pair, so pyramidal structure.$I_3^{-}$ has $s{p}^{3}d$ hybridisation and geometry is linear. There are three lone pairs and two bond pairs on the central atom.
$S{O}_3^{2-}$ has $s{p}^3$ hybridisation and geometry is pyramidal. There are three bond pairs and one lone pair on the cebntral atom.
$N{O}_3^{-}$ has $s{p}^2$ hybridisation and geometry is trigonal planar. There are three bond pairs and no lone pairs on the central atom.


So option (b) is the correct answer, both have $s{p}^3$ hybridization and one lone pair and their shape is pyramidal.