$XeF_6$ on complete hydrolysis gives:

$XeF_6$ on partial hydrolysis with water produces a compound '$X$'. The same compound '$X$' is formed when $XeF_6$ reacts with silica. The compound '$X$' is

Xenon $(VI)$ fluoride on complete hydrolysis gives an oxide of xenon '$O$'. The total number of $\sigma$ and $\pi$ bonds in '$O$' is

$XeF_6$ on partial hydrolysis gives

The hybridisation and structure of $XeF_6$ is :

The reason for not storing $XeF_6$ in a glass or a quartz vessel is that