Which pair of molecules are polar species?

The bond length of $HCl$ molecule is $1.275 \ \text{Å}$ and its dipole moment is $1.03 \ \text{D}$. The ionic character of the molecule (in percent) (charge of the electron $= 4.8 \times 10^{-10} \ \text{esu}$) is

Which of the following statements regarding $NH_3$ and $NF_3$ is correct?

Identify the correct statements from the following. $(1)$ The dipole moment of $CO_2$ and $BF_3$ is zero. $(2)$ The dipole moment of $NF_3$ is higher than the dipole moment of $NH_3$. $(3)$ The dipole moment of $HI$ is lower than the dipole moment of $HCl$.

Write the significance and applications of dipole moment.

The critical temperature of water is higher than that of $O_2$ because $H_2O$ molecules ......