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Explain why BeH(2) molecule has a zero d...

Explain why `BeH_(2)` molecule has a zero dipole moment although the Be–H bonds are polar.

Text Solution

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`BeH_(2)(H-Be-H)` molecular is linear with sp hydridisation, so that two `Be-H` bond mements are equal and opposite and hence cancel the effect of each other.
`EN` of `H (2.1)`gt`EN` of `Be (1.5)`
So, the bond dipoles in `BeH_(2)` are directed towards more EN H-atom (H-Be).
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