The compound of xenon with zero dipole moment is

Which of the following molecules has a zero dipole moment?

If $H-X$ bond length is $2 \ \mathring{A}$ and $H-X$ has dipole moment $5.12 \times 10^{-30} \ C \cdot m$,the $\%$ of covalent character of the molecule is ............. $\%$

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

The pair from the following pairs having both compounds with net non-zero dipole moment is

Which of the following possess a net dipole moment?