Q37 / 180 · AIIMS 2007 · Chemistry

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

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

Solution

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

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

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