(A) The central atom $Cl$ in $ClO_3^-$ has $7$ valence electrons. It forms $3$ single bonds with $O$ atoms and has $1$ lone pair. According to $VSEPR$

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(A) The central atom $Cl$ in $ClO_3^-$ has $7$ valence electrons. It forms $3$ single bonds with $O$ atoms and has $1$ lone pair. According to $VSEPR$ theory,the steric number is $3 + 1 = 4$,which corresponds to $sp^3$ hybridization. Due to the presence of one lone pair,the geometry is distorted from tetrahedral to trigonal pyramidal.