Why `CO_(2)`, molecule has zero dipole moment although carbon - oxygen bonds are polar.

Which molecules has zero dipole moment ?

Explain why BeH_(2) molecule has a zero dipole moment although the Be-H bonds 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.

The molecule having zero dipole moment is

The molecule which has zero dipole moment is

The molecule which has zero dipole moment is