Question

Formal charge on sulphur in $S{O}_2$ is:

Answer 1

$S$ atom has six valence electrons out of which $2$ remain as lone pair of electrons and $4$ are shared with $2$ oxygen atoms to form covalent bonds.
Hence, neither an electron is gained nor it is lost. Hence, neither negative nor positive charge is present on $S$ atom.
Hence, the formal charge on $S$ atom in $S{O}_2$ is zero.