Question

Choose the correct option regarding polarity of N2 and NH3 ​molecules.

• A. $N_2$: polar compound ;
  $N{H}_3$: nonpolar compound
• B. $N_2$: nonpolar compound ;
  $N{H}_3$:nonpolar compound
• C. $N_2$: nonpolar compound ;
  $N{H}_3$:polar compound
• D. $N_2$: polar compound ;
  $N{H}_3$: polar compound

Answer 1

The correct option is C $N_2$: nonpolar compound ;

$N{H}_3$:polar compound

• The $N_2$ molecule is made up of 2 nitrogen atoms. Since two atoms of the same elements have exact same properties, hence there won't be any electronegativity difference between those two atoms.

Therefore, $N_2$ is a non-polar covalent molecule.

• The $N{H}_3$ molecule is made up of 1 nitrogen atom and 3 hydrogen atoms. Now we know that, there is a considerable electronegative difference between nitrogen and hydrogen atoms.

Therefore, $N{H}_3$ is a polar covalent molecule.