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

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The Lewis structure for BeH molecule is as follows:

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

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

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