By definition
Definition of electronegativity
The electronegativity of an element is defined as the relative ability of an atom to attract electrons from another atom to chemically bond and form a compound.
In other words, electronegativity is a measure of the attractive force that one atom exerts on the electrons of another when a chemical bond forms.
Polarity of a bond
The polarity of a chemical bond occurs when there is an asymmetric distribution of the electron cloud of the bond around the two atoms that form said bond. This happens when both atoms have different electronegativity.
This is, the polarity of a bond is determined by the difference in electronegativity between the atoms that form it.
If the atoms forming the bond have very similar electronegativities, the bond is nonpolar.
On the contrary, if the difference in electronegativity is appreciable, the bond is polar and the electrons are not shared in a balanced way, creating electric dipoles.
Polarity of a molecule
There are molecules whose bonds are polar and yet the molecules are nonpolar due to their geometry. This causes the dipole moments of the individual bonds to be canceled and, globally, the molecule will be apolar.
That is, the different dipole moments cancel each other out.
Answer
In summary, its is possible for a molecule to have a polar bond but have an overall polarity of nonpolar.
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