Which one of the following noble gases is not found in the atmosphere?

$Xe_{(g)}$ and $F_{2(g)}$ react in the ratio $1:20$ at $573 \ K$ and $60-70 \ bar$ to form $A$. When $A$ is completely hydrolyzed,$B$ and $HF$ are formed. $A$ and $B$ are respectively:

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

Which of the following is an inert element?

$XeF_4$ on partial hydrolysis produces

Which of the following is the life-saving mixture for an asthma patient?