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Question -

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



Answer -

The Lewis structure for BeH2 is as follows:

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 linearstructure.

Dipolemoments of each H–Be bond are equal and are in opposite directions. Therefore,they nullify each other. Hence, BeH2 molecule has zerodipole moment.

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