A mixture of water (H2O) and ammonia (NH3):

Water and ammonia both have hydrogen atoms bonded to highly electronegative atoms (oxygen and nitrogen), and each molecule has lone pairs that can attract those hydrogen atoms. This lets water and ammonia form hydrogen bonds with each other, so the best choice is hydrogen bonding. Dipole–dipole and London dispersion forces also occur, but hydrogen bonding is the distinctive strongest interaction here.

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