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

Explain why BeF_(2) , molecule has zero dipolemoment although the Be-F bonds are polar.

Why BeH_2 molecule has zero dipolemoment although the Be-H bonds are polar ?

Explain why BeH_2 molecule has zero diple moment even though the Be-H bond are polar.

Explain the following : (i) Ionic compounds have high melting and boiling points. (ii) Ice floats over water. (iii) BeH_(2) molecule has zero dipole moment although although the Be-H bonds are polar.

Which molecules has zero dipole moment ?

Which molecules has zero dipole moment ?