Which is the most easily liquefiable rare gas?

What is the oxidation state of xenon in xenon monooxytetrafluoride?

In reaction $(1)$,$XeF_6$ undergoes complete hydrolysis to form $HF$ and $X$. In reaction $(2)$,$XeF_6$ undergoes partial hydrolysis to form $HF$,$Y$,and $Z$. The products $X, Y, Z$ respectively,are

Who among the following discovered $Argon$?

The noble gas which forms the maximum number of compounds is

In $XeO_3$ and $XeF_6$ the oxidation state of $Xe$ is