Which noble gas is most abundant in the atmosphere?

Which of the following is an uncommon hydrolysis product of $XeF_{2}$ and $XeF_{4}$?

The number of peroxide bonds in the perxenate ion $[XeO_6]^{4-}$ is ........

The noble gas was first discovered by

Which one has the highest boiling point?

Select the $INCORRECT$ statement regarding the following reactions:
$XeF_6 + \text{excess } H_2O \rightarrow 'X' + HF$
$XeF_6 + 2 \text{ moles } H_2O \rightarrow 'Y' + HF$