Question

BF3 and H2O are triatomic molecules but H2O have dipole moment greater than zero why

Answer 1

H₂O has a bent shape and electronegativity of O is more as compared to H atoms .Therefore net dipole in H₂O is directed towards O.

BF₃ has a linear shape .Though F is more electronegative than B but as F is present on both sides of B in BF₃ molecule, therefore net dipole comes out to be zero.