Why dipole moment of CO2 is why?

The structure of CO₂ is this is a highly symmetrical structure with a plane of symmetry passing through the carbon. The bond dipole of C–O is directed towards oxygen as it is the negative end. Here two equal dipoles acting in opposite direction cancel each other and therefore the dipole moment is zero.

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Why dipole moment of H2O greater thna F2O ?

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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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