The first ionisation potential is maximum for

Which of the following relations is correct with respect to the first $(I)$ and second $(II)$ ionization potentials of sodium $(Na)$ and magnesium $(Mg)$?

Which of the following statements is incorrect?

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

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

What is the order of first,second,and third ionisation enthalpy? Why?