What group of molecules have zero dipole moment?
The molecules that have zero dipole moment are CO2, BF3, H2, N2, SO3, CCl4, and CS2 (c) due to their symmetrical structure which cancels out individual bond polarity.
Explanation:
The group of molecules that have a zero dipole moment is c. CO2, BF3, H2, N2, SO3, CCl4 and CS2. Molecules with zero dipole moments are those with balanced or 'symmetrical' geometrical shapes, where the individual bond polarity cancels out. For example, CO2 is a linear molecule with two polar bonds that are symmetrically opposed, thus resulting in a zero dipole moment. Piece by piece, we find that each of these molecules in option c follow a symmetrical structure, therefore giving them zero dipole moment.