Question

Number of compounds/species from the following with non-zero dipole moment is ______
$\text{BeCl}_2, \, \text{BCl}_3, \, \text{NF}_3, \, \text{XeF}_4, \, \text{CCl}_4, \, \text{H}_2\text{O}, \, \text{H}_2\text{S}, \, \text{HBr}, \, \text{CO}_2, \, \text{H}_2, \, \text{HCl}$

Answer 1

Among the given molecules:
Polar molecules with non-zero dipole moment ($\mu \neq 0$): NF$_3$, H$_2$O, H$_2$S, HBr, HCl.
Non-polar molecules with zero dipole moment ($\mu = 0$): BeCl$_2$, BCl$_3$, XeF$_4$, CCl$_4$, CO$_2$, H$_2$.