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dipole moments are based on partial positive and negative ends of a molecule. You can determine through the electronegativity differences in the molecule. Since O is more electronegative than S, O has a partial negative charge and S has a partial positive charge. There is a dipole moment within the molecule. SO2 is also a polar molecule.
Dipole-dipole usually exists between polar molecules. Thus, to determine, just draw out the lewis structure of the molecule and see if it's polar or not. To determine whether it's polar, you will need to find its dipole moment and its molecular shape.
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