Which of the following liquids is not deflected by a non-uniform electrostatic field?

Which of the following molecules is the most polar?

Which molecule has the maximum dipole moment $\mu$? (where $X = -NO_2$)

Although both $CO_2$ and $H_2O$ are triatomic molecules,the shape of $H_2O$ molecule is bent while that of $CO_2$ is linear. Explain this on the basis of dipole moment.

Which of the following molecules has no dipole moment?

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