Answer
SO2 - sp2
SO3 - sp2
SO3^2- - sp3
SCl4 - sp3d
SCl6 - sp3d2
S2Cl2 - sp3
Work Step by Step
Start with the Lewis diagram for each. One way to do it is to use VSEPR theory to predict the geometry. The geometry will tell you the hybridization
linear = sp
trigonal planar or bent (120) = sp2
tetrahedral, trigonal pyramidal, bent (109.5) = sp3
trigonal bipyramidal, see-saw, T-shaped, linear = sp3d
octahedral, square pyramidal, square planar = sp3d2
SO2 - sp2
SO3 - sp2
SO3^2- - sp3
SCl4 - sp3d
SCl6 - sp3d2
S2Cl2 - sp3