Question

The following compounds are non-polar except _______.

• A. $N_2$
• B. $C{l}_2$
• C. $O_2$
• D. $N{H}_3$

Answer 1

The correct option is D $N{H}_3$

$\bullet$ Electronegativity is the ability of an atom to attract the shared pair of electrons in a molecule.

$\bullet$ When atoms of elements with different electronegativities form a molecule, the atom with higher electronegativity attracts the shared pair of electrons towards itself as a result developing partial charges. These bonds are called polar covalent bond. Hence, ${\text{NH}}_3$ is polar covalent compound

$\bullet$ ${\text{N}}_2$, ${\text{Cl}}_2$ and ${\text{O}}_2$ are formed from the atoms of the same element. Since they have same electronegativities, they form non-polar molecules.