Final answer:
In the liquid state, hydrogen bonding is the strongest attractive force between molecules of similar size and mass.
Explanation:
Among two molecules in the liquid state with nearly the same size and mass, the strongest attractive force would be hydrogen bonding. Hydrogen bonds are a special type of dipole-dipole attraction that forms between a hydrogen atom bonded to one of the most electronegative elements (such as F, O, or N) and another molecule with a partially negative atom.
Dipole-dipole interactions and London dispersion forces are other types of attractive forces, but hydrogen bonding is typically stronger, especially in molecules with heavy atoms.
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