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.
Related Questions:
(1) The Dipole moment of Chloromethane is more than Fluoromethane. Explain.
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