Number of compounds from the following with zero dipole moment is ______.
HF, H2, H2S, CO2, NH3, BF3, CH4, CHCl3, SiF4, H2O, BeF2
Explanation
H2, CO2, BF3, CH4, SiF4 and BeF2 are symmetric molecules, hence their individual bond dipoles cancel out resulting in zero net dipole moment.
All remaining molecules are either bent, pyramidal or unsymmetrical and hence polar.