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EEJ MAIN Chemistry QUESTION #5554
Question 1
In which of the following processes does the bond order increase AND the magnetic character change from paramagnetic to diamagnetic?
  • $NO \to NO^+$✔️
  • $N_2 \to N_2^+$
  • $O_2 \to O_2^+$
  • $O_2 \to O_2^{2-}$
Correct Answer Explanation
$NO$: BO = 2.5, paramagnetic (1 unpaired $\pi^*$ electron). $NO^+$: BO = 3.0 (loses the unpaired $\pi^*$ electron), diamagnetic. Bond order increases (2.5 → 3.0) AND changes from paramagnetic to diamagnetic. Other options either decrease bond order or don't change magnetic character as required.