Q33 / 180 · AIIMS 2015 · Chemistry

Assertion : Molecular nitrogen is less reactive than molecular oxygen. Reason : The bond length of $\mathrm{N}_2$ is shorter than that of oxygen.

  • Correct answer
    A
    If both assertion and reason are true and reason is the correct explanation of assertion.
  • B
    Ifboth 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.

Solution

Bond order of $\mathrm{N}_2=3$, bond order of $\mathrm{O}_2=2$. Higher the bond order, shorter is the bond length and higher is the bond dissociation energy i.e., higher stability or lesser reactivity. Thus, $\mathrm{N}_2$ is less reactive than $\mathrm{O}_2$.

Hence, the correct answer is option: 'A'.

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