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Q.
The compound that attacks pyrex glass is
The p-Block Elements - Part2
Solution:
$XeF_6$ can be sublimed at room temperature it is more susceptible to hydrolysis $XeF_6$ melt to give yellow liquid, since it attacks pyrex glass because silica react with $XeF_6$.
$2 XeF_6 + 3SiO_2 \rightarrow 3SiF_4 + 2XeO_3$