Question

Assertion: Molecular nitrogen is less reactive than molecular oxygen.
Reason: The bond length of $N_2$ is shorter than that of oxygen.

• A. If both assertion and reason are true and reason is the correct explanation of assertion
• B. If both assertion and reason are true but reason is not the correct explanation of assertion
• C. If assertion is true but reason is false
• D. If both assertion and reason are false

Answer 1

Answer: (B)

Bond order of $N_2=3$, bond order of $O_2=2$ Higher the bond order, higher is the bond dissociation energy i.e. higher stability or less reactivity. Thus $N_2$ is less reactive than $O_2$.

Higher the bond order, shorter is the bond length. Higher bond order of $N_2$ shows its shorter bond length.