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NCERT Class XI Chemistry Solutions

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Question : 22 of 40
Marks: +1, -0
Explain why BeH2\mathrm{BeH}_2 molecule has a zero dipole moment although the Be H bonds are polar?
Solution:  
The dipole moment in case of BeH2\mathrm{BeH}_2 is zero. This is because the two equal bond dipoles point in opposite directions and cancel the effect of each other.
Bond dipoles in BeH2\mathrm{BeH}_2
H−←Be−↦H\mathrm{H} \underset{\leftarrow}{-} \mathrm{Be} \underset{\mapsto}{-} \mathrm{H}
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