If a molecule AB3 has zero dipole moment, the sigma bonding orbitals used by A are pure p or hybrids?

If a molecule AB3 has zero dipole moment, the sigma bonding orbitals u

1.	If a molecule AB3 has zero dipole moment, the sigma bonding orbitals used by A are pure p or hybrids?
Answer» the p orbital used up here are not pure but HYBRID as during hybridization a trigonal planer geometry is obtained . in this geometry the DIPOLE moment is ZERO if the compound AB3 is formed by the pure p orbital overlap then the angle between 3 ligand will be 90 degree and structure formed WOULD have some non zero dipole moment .