Question

which of the following has a polar covalent bond? 1. n₂ 2. o₂ 3. kcl 4. co 5. li₂o

Explanation:

A polar covalent bond occurs when there is an electronegativity difference between the two atoms in a covalent - bonded molecule. In $N_2$ and $O_2$, the atoms are identical, so the electronegativity difference is 0, and they have non - polar covalent bonds. $KCl$ and $Li_2O$ are ionic compounds formed by the transfer of electrons between a metal and a non - metal. In $CO$, carbon and oxygen have different electronegativities, creating a polar covalent bond.

Answer:

1. CO