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PART - 1 CH - 4 Chemical Bonding and Molecular Structure — Chemistry STD 11 Science — Question

Rajasthan BoardEnglish MediumSTD 11 ScienceChemistryPART - 1 CH - 4 Chemical Bonding and Molecular Structure2 Marks
Question
Explain why $BeH _2$ molecule has a zero dipole moment although the $Be - H$ bonds are polar.
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Answer

In $BeH _2$ the $Be - H$ bond is polar but its linear bond angle is $180^{\circ}$. Due to this two same bond dipole are in opposite direction and they cancel effect of each other. Hence dipole moment of $BeH _2$ is zero. Other example : $BeF _2$.
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