The correct order of enthalpy of vaporisation of noble gases is

$Xe_{(g)}$ and $F_{2(g)}$ react in the ratio $1:20$ at $573 \ K$ and $60-70 \ bar$ to form $A$. When $A$ is completely hydrolyzed,$B$ and $HF$ are formed. $A$ and $B$ are respectively:

Which of the following is the correct series of noble gases in the periodic table?

What is the percentage of $Argon$ in the air (in $\%$)?

Which of the following statements are correct regarding $XeF_2$ and $XeF_4$?

What is the number of lone pairs of electrons on the $Xe$ atom in the molecules $XeF_2$,$XeF_4$,and $XeF_6$ respectively?