Among the following compounds,the one which shows the highest dipole moment is

If an $AB_3$ molecule (containing four atoms) has a dipole moment of zero and another has a non-zero dipole moment,what does this indicate about their shapes?

Which of the following is polar?

Which one of the following arrangements of molecules is correct on the basis of their dipole moments?

The correct order of dipole moment of the molecules $NH_3$ $(I)$,$BF_3$ $(II)$,$H_2O$ $(III)$,$NF_3$ $(IV)$ is

Number of compounds/species from the following with non-zero dipole moment is. . . . . . $BeCl_2, BCl_3, NF_3, XeF_4, CCl_4, H_2O, H_2S, HBr, CO_2, H_2, HCl$