If the bond length and dipole moment of a diatomic molecule are $1.25 \ \mathring{A}$ and $1.0 \ D$ respectively,what is the percent ionic character of the bond?

Which of the following compounds does not possess a dipole moment?

Which of the following molecules has a zero dipole moment?

Dipole moment of $HCl = 1.03 \ D$,$HI = 0.38 \ D$. Bond length of $HCl = 1.3 \ \mathring{A}$ and $HI = 1.6 \ \mathring{A}$. The ratio of the fraction of electric charge,$\delta$,existing on each atom in $HCl$ and $HI$ is

$H_2O$ is dipolar,whereas $BeF_2$ is not. It is because

The correct order of dipole moment of the molecules $NH_3$ $(I)$,$BF_3$ $(II)$,$H_2O$ $(III)$,$NF_3$ $(IV)$ is