Question

Which of the following statement is true?

• A. Th boiling point of NO is higher than that of $N_2$ because the former has higher molecular weight.
• B. The boiling point of NO is higher because of greater vander Waals forces than in $N_2$.
• C. The boiling point of NO is higher than that of $N_2$ because of dipole-dipole forces.
• D. The boiling point of $N_2$ is higher because $N_2$ is inert.

Answer 1

The correct option is C The boiling point of NO is higher than that of $N_2$ because of dipole-dipole forces.

Boiling point of NO ($-{125}^{\circ }C$) is much higher than that of $N_2-{195}^{\circ }C$ because NO is polar and its molecules are attracted intermolecularly by dipole-dipole forces, $N_2$ is nonpolar.