Explain why BeH2 molecule has a zero dipole moment although the Be–H bonds are polar.

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CBSE | Chemical Bonding and Molecular Structure | Chemistry | Class 11 | NCERT

Explain why BeH2 molecule has a zero dipole moment although the Be–H bonds are polar.

Answer:

The dipole moment of a molecule with symmetrical and linear geometries is zero because they are vector in nature and the dipole of different bonds cancel with one another, whereas the dipole moment of a molecule with unsymmetrical and bent geometries is specific because the bond polarities do not cancel with one another.