Question

Explain the beh2has zero dipole moment although be-h bond are polar

Answer 1

The dipole moment in case of BeH2 is zero.Although the Be–H bonds are polar. Dipole moments of each H–Be bond are equal and are in opposite directions. Therefore, they nullify each other. Hence, BeH2 molecule has zero dipole moment

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Answer 2

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

The Lewis structure for BeH2 is as follows:

Since there is no lone pair at the central atom (Be) and there are two bond pairs, BeH2 is of the type AB2. It has a linear structure.

Dipole moments of each H–Be bond are equal and are in opposite directions. Therefore, they nullify each other. Hence, BeH2 molecule has zero dipole moment.

While in Be---H , dipole moment of Be  & H are not equal & they donot nullify each other.hence has a specific dipole moment.