Which of the following noble gases exhibits higher oxidation states?

Which noble gas is the most abundant in the atmosphere?

The density of nitrogen obtained by the liquefaction of air is higher than that of nitrogen obtained by chemical reactions from nitrogenous compounds. This is due to the presence of which gas in the atmospheric nitrogen?

$SbF_5$ reacts with $XeF_4$ to form an adduct. The shapes of cation and anion in the adduct are respectively:

The difference in the oxidation state of $Xe$ between the oxidized product of $Xe$ formed on complete hydrolysis of $XeF_4$ and $XeF_4$ is

Which of the following Xenon compounds does not produce explosive $XeO_3$ on its complete hydrolysis?