Select the gas-phase reaction$(s)$ which can proceed spontaneously?

The correct order of $C$, $N$, $O$ and $F$ in terms of second ionisation potential is

The correct trend in the first ionization enthalpies of the elements in the $3^{rd}$ period of periodic table is:

Which of the following sets is correct regarding the ionization potential?

For which of the following reactions is the $\Delta H^o$ value equal to the first ionization energy of $Ca$?

Given below are two statements $:$
Statement $(I) :$ The first ionisation enthalpy of group $14$ elements is higher than the corresponding elements of group $13.$
Statement $(II) :$ Melting points and boiling points of group $13$ elements are in general much higher than those of the corresponding elements of group $14.$ In the light of the above statements,choose the most appropriate answer from the options given below $:$