Which of the following pairs of molecules has a net zero dipole moment for both of its members?

Step-by-step solution

The net dipole moment of a molecule is the vector sum of all its bond dipoles and lone pair dipoles. For CO ₂ (linear), the dipole moment is zero. However, SO ₂ has a bent structure due to one lone pair on sulfur, resulting in a non-zero dipole moment. For BF ₃ (trigonal planar), the dipole moment is zero. NH ₃ has a trigonal pyramidal structure with one lone pair, giving it a non-zero dipole moment. For H ₂ O and H ₂ S , both have bent structures with two lone pairs on the central atom, so both have non-zero dipol