$Xe{{F}_{6}}\,\xrightarrow{+\,Excess\,\,{{H}_{2}}O}\,'X'\,+\,HF$
$Xe{{F}_{6}}\,\xrightarrow{+\,2\,\,{{H}_{2}}O}\,'Y'\,+\,HF$
\(Xe{{F}_{6}}\,\xrightarrow{+\,2\,\,{{H}_{2}}O}\,\underset{(Y)}{\mathop{Xe{{O}_{2}}{{F}_{2}}\,}}\,+\,HF\)
\(Y\) is not an oxyacid of xenon.