Question

which compound contains only a nonpolar covalent molecule?
o o₂
o hcl
o h₂o
o no₃

Explanation:

Non - polar covalent bonds occur between atoms with the same electronegativity. In $O_2$, two oxygen atoms share electrons equally as they are the same element. In $HCl$, $H_2O$ and $NO_3$, there are differences in electronegativity between the atoms, leading to polar covalent bonds.

Answer:

A. $O_2$