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 3 bond pairs and and one lone pair, so its actual structure is pyramidal.$I_3^{-}$ has geometry is linear. While there are three Iodine atoms, one of the atoms has a negative charge which further gives 3 lone pairs of electrons and 2 bond pairs.
$S{O}_3^{2-}$ has geometry pyramidal. There are three bond pairs and one lone pair on the cebntral atom.
$N{O}_3^{-}$ has geometry is trigonal planar. There are three bond pairs and no lone pairs on the central atom.


So option (b) is the correct answer, hybridization and one lone pair and their shape is pyramidal.