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(C) To determine the geometry,we analyze the structure of each species:$1$. $SO_3^{2-}$ (Sulfite ion): The central $S$ atom has $3$ bond pairs and $1$

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$1$

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(C) To determine the geometry,we analyze the structure of each species:$1$. $SO_3^{2-}$ (Sulfite ion): The central $S$ atom has $3$ bond pairs and $1$ lone pair. According to $VSEPR$ theory,this results in a trigonal pyramidal geometry.$2$. $SO_4^{2-}$ (Sulfate ion): The central $S$ atom has $4$ bond pairs and $0$ lone pairs,resulting in a tetrahedral geometry.$3$. $S_2O_3^{2-}$ (Thiosulfate ion): The central $S$ atom is bonded to $3$ oxygen atoms and $1$ sulfur atom,with $0$ lone pairs,resulting in a tetrahedral geometry.$4$. $S_2O_7^{2-}$ (Pyrosulfate ion): Each central $S$ atom is bonded to $4$ oxygen atoms with $0$ lone pairs,resulting in a tetrahedral geometry around each sulfur atom.Thus,only $SO_3^{2-}$ has a pyramidal geometry. The total number of such species is $1$.

The number of species from the following that have pyramidal geometry around the central atom is . . . . . . . . .
$S_2O_3^{2-}, SO_4^{2-}, SO_3^{2-}, S_2O_7^{2-}$

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The number of species from the following that have pyramidal geometry around the central atom is . . . . . . . . . $S_2O_3^{2-}, SO_4^{2-}, SO_3^{2-}, S_2O_7^{2-}$