Which of the following is a polar molecule?

The unequal sharing of bonded pair of electrons between two atoms in a molecule causes

Which of the following would have a permanent dipole moment?

If $B-Cl$ bond has a dipole moment,explain why $BCl_3$ molecule has zero dipole moment.

If $HCl$ were purely ionic,its expected dipole moment would be $6.12 \, D$. However,the experimental dipole moment is $1.03 \, D$. Calculate the percentage ionic character. (in $\%$)

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.