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H2O has a non-zero dipole moment while BeF2 has zero dipole moment because

1. H2O molecule is linear while BeF2 is bent
2. BeF2 molecule is linear while H2O is bent
3. Fluorine has more electronegativity than oxygen
4. Beryllium has more electronegativity than oxygen

Correct answer: BeF2 molecule is linear while H2O is bent

Solution

H2O has a bent structure due to lone pairs on oxygen, resulting in a net dipole moment. BeF2 is linear, so the dipole moments of the two Be-F bonds cancel out.

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