1. Tardigrade
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  3. Chemistry
  4. Which of the following presents the correct order of second ionization enthalpies of C, N, O and F?

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Q. Which of the following presents the correct order of second ionization enthalpies of C, N, O and F?

AIEEEAIEEE 2012

Solution:

In a period the value of ionisation potential increases from left to right with breaks where the atoms have some what stable configuration. After removing an $e^-$ oxygen will acquire stable configuration. Hence $O^+$ has highest second ionisation enthalpy than $F^+$ and $N^+$
$\therefore \quad$ correct order is O > F > N > C