(C) The central atom in $SO_2$ is sulphur $(S)$.Sulphur has $6$ valence electrons.In $SO_2$,sulphur forms two double bonds with two oxygen atoms.Numbe

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(C) The central atom in $SO_2$ is sulphur $(S)$.Sulphur has $6$ valence electrons.In $SO_2$,sulphur forms two double bonds with two oxygen atoms.Number of electron pairs around sulphur = $2$ (bonding pairs) + $1$ (lone pair) = $3$.Since the steric number is $3$,the hybridization is $sp^2$.