According to standard tables of hybridisation, the central atom tetragonal arrangements should always be regarded to have sp3 hybridised orbitals (disregarding Bent's rule).
So, the sulphate ion SO42-, should therefore have S with sp3 orbitals. But, in the VB theory framework SO42- is usually drawn with two double bonds to O, implying participation of two d orbitals. But then, shouldn't S have sp3d2 hybridised orbitals for this to work? But sp3d2 is used for octahedral arrangements as in SF6 which is clearly not the case for the sulphate ion.
I know this participation of d orbitals have been theoretically firmly disproved, but still, VB theory (with its hybridisation schemes) and classic Lewis structures should be consistent, shouldn't they?