Which of the following chemical species have a permanent non-zero dipole moment? — Chemical Bonding Chemistry Question

💡 Solution & Explanation

$NO_2$ is bent due to an odd electron. $O_3$ (ozone) has a bent V-shape due to a lone pair on the central oxygen. $XeOF_4$ is square pyramidal, lacking symmetry across the vertical axis. All these are polar. $SiF_4$ is perfectly tetrahedral and symmetrical, yielding $\mu=0$.