The correct set of species with zero dipole moment is:
$(i) \, CO_2, \, (ii) \, COCl_2, \, (iii) \, CH_2Cl_2, \, (iv) \, BCl_3$

Which of the following pairs of molecules will have a permanent dipole moment?

The electronegativity difference between $N$ and $F$ is greater than that between $N$ and $H$,yet the dipole moment of $NH_3$ $(1.5 \ D)$ is larger than that of $NF_3$ $(0.2 \ D)$. This is because

In which of the following molecules is $\mu$ (observed) found to be greater than $\mu$ (theoretical)?

Dipole moment of $HCl = 1.03 \ D$ and $HI = 0.38 \ D$. Bond length of $HCl = 1.3 \ \mathring{A}$ and $HI = 1.6 \ \mathring{A}$. The ratio of the fraction of electric charge,$\delta$,existing on each atom in $HCl$ and $HI$ is:

Which of the following compounds exhibits a non-zero dipole moment?