Question

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

Explanation:

• For \(O_2\): It consists of two identical oxygen atoms. The electrons are shared equally between the two oxygen atoms. There is no difference in electronegativity (since both atoms are the same), so the bond is non - polar covalent.
• For \(HCl\): Chlorine is more electronegative than hydrogen. The electrons are not shared equally, with the electron density being higher around the chlorine atom. So, the \(H - Cl\) bond is polar covalent.
• For \(H_2O\): Oxygen is more electronegative than hydrogen. The \(O - H\) bonds are polar. Also, due to the bent shape of the water molecule, the overall molecule is polar.
• For \(NO_3\) (assuming it's \(NO_3^-\) or \(NO_3\) in a compound context, but if we consider the bonds within a hypothetical \(NO_3\) molecule - like in nitrate ion, nitrogen and oxygen have different electronegativities. The \(N - O\) bonds are polar.

Answer:

\(O_2\)