.
Let’s draw the structure of both two compounds and then analyses
it.
In both H2O
and F2O the structure is quite the same. In H2O as O is
more electronegative than hydrogen so the resultant bond dipole is towards O, which
means both the lone pair and bond pair dipole are acting in the same direction
and dipole moment of H2O is high. In case of F2O the bond dipole is
acting towards fluorine, so in F2O the lone pair and bond pair
dipole are acting in opposition resulting in a low dipole
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