Which of the following noble gases does not form clathrate compounds?

Noble gases are the group of elements which show very .......

From which of the following are noble gases $NOT$ obtained?

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

Least chemical activity is shown by

Which of the following gas is/are called rare gas?