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Explain Why Beh2 Molecule Has a Zero Dipole Moment Although the Be–H Bonds Are Polar. - Chemistry

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

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Solution 1

BeH2is a linear molecular (H—Be—H), the bond angle = 180°.

Be—H bonds are polar due to a difference in their electronegativity but the bond polarities cancel each other. Thus, molecule has resultant dipole moment of zero

Solution 2

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 linear structure.

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

Concept: Kossel-lewis Approach to Chemical Bonding - Lewis Representation of Simple Molecules (The Lewis Structures)
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NCERT Class 11 Chemistry Textbook
Chapter 4 Chemical Bonding and Molecular Structure
Q 22 | Page 130
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