What is the physical shape and dipole moment of $H_2S$?

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

The molecular size of $ICl$ and $Br_2$ is approximately the same,but the $b.p.$ of $ICl$ is about $40 \ ^oC$ higher than that of $Br_2$. This is because:

$BF_3$ and $NF_3$ are both covalent molecules,but $BF_3$ is non-polar and $NF_3$ is polar. The reason for this is:

Select the correct statement$(s)$.

Which of the following has the maximum dipole moment?