nonpolar
No, it's nonpolar.
Hydrogen gas, H2, is nonpolar because both hydrogen atoms have the same electronegativity, so the difference in electronegativity is 0, which means the bond is nonpolar, and since this is the only bond, the gas is nonpolar.
It would be nonpolar. But since it has two atoms of the same type it would be an element, not a compound.
Polar, it has a dipole moment of 1.85 D which is very polar.
ethyne (or acetylene) is non polar
nonpolar or polar
polar covalent
Nonpolar
non polar
yes
Some gases have polar molecules as HCl, HBr, SO2, but not all gases have polar molecules.