Which one of the following statements is incorrect in relation to ionization enthalpy?

  • A
    Ionization enthalpy increases for each successive electron.
  • B
    The greatest increase in ionization enthalpy is experienced on removal of electron from core noble gas configuration.
  • C
    End of valence electrons is marked by a big jump in ionization enthalpy.
  • D
    Removal of electron from orbitals bearing lower $n$ value is easier than from orbital having higher $n$ value.

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Among the second period elements,the actual ionization enthalpies are in the order $Li < B < Be < C < O < N < F < Ne$. Explain why:
$(i)$ $Be$ has higher $\Delta_{i}H$ than $B$
$(ii)$ $O$ has lower $\Delta_{i}H$ than $N$ and $F$?

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Which is the correct order of ionization energies?

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For elements $B$,$C$,$N$,$Li$,$Be$,$O$ and $F$,the correct order of first ionization enthalpy is:

The first ionisation energy of oxygen is less than that of nitrogen. Which of the following is the correct reason for this observation?

If first ionization enthalpy $(\Delta_i H)$ values of $Na$,$Mg$ and $Si$ are respectively $496$,$737$ and $786 \ kJ \ mol^{-1}$,the first ionization enthalpy value of $Al$ (in $kJ \ mol^{-1}$) will be

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