Which of the following is monoatomic?

What is the state of hybridisation of $Xe$ in the cationic part of solid $XeF_6$?

The correct order of enthalpy of vaporisation of noble gases is

The low chemical reactivity of the rare gases can be attributed to their

As we move down the group in noble gases,which of the following values decreases due to the addition of successive electronic shells?

Consider the following transformations:
$I. XeF_6 + NaF \to Na^+[XeF_7]^-$
$II. 2PCl_{5(s)} \to [PCl_4]^+[PCl_6]^-$
$III. [Al(H_2O)_6]^{3+} + H_2O \to [Al(H_2O)_5OH]^{2+} + H_3O^+$
Which of the above transformations are correct?