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

Water and ammonia are both polar molecules, and each has hydrogen atoms bonded to highly electronegative atoms (oxygen or nitrogen). Their molecules can form hydrogen bonds: a hydrogen attached to oxygen or nitrogen is attracted to a lone pair on the other molecule. Hydrogen bonding is the best choice here; ordinary dipole–dipole and London dispersion forces also occur, but they are weaker.

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