Which of the following molecules will have polar bonds but zero dipole moment?

Although both $CO_{2}$ and $H_{2}O$ are triatomic molecules,the shape of $H_{2}O$ molecule is bent while that of $CO_{2}$ is linear. Explain this on the basis of dipole moment.

Among the following,the most polar molecule is

Which of the following compounds has zero dipole moment?

Positive dipole moment is present in

Which of the following is the correct order of dipole moment for the given molecules?