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

Which of the following bonds is the most polar?

Which of the following molecules have non-zero dipole moments?
$I$. Gauche conformation of $1, 2$-dibromoethane
$II$. Anti conformation of $1, 2$-dibromoethane
$III$. Trans-$1, 4$-dibromocyclohexane
$IV$. Cis-$1, 4$-dibromocyclohexane
$V$. Tetrabromomethane
$VI$. $1, 1$-dibromocyclohexane

Which bond angle $\theta$ gives maximum dipole moment for a triatomic molecule $XY_2$?

Which of the following is a non-polar solvent?

Identify the correct statements from the following. $(1)$ The dipole moment of $CO_2$ and $BF_3$ is zero. $(2)$ The dipole moment of $NF_3$ is higher than the dipole moment of $NH_3$. $(3)$ The dipole moment of $HI$ is lower than the dipole moment of $HCl$.