$2XeO{F_4}\, + \, Si{O_2} \, \to \,2Xe{O_2}{F_2}\, + \,Si{F_4}$
$2Xe{O_2}{F_2}\, + \,Si{O_2}\, \to \,\mathop {2Xe{O_3}}\limits_{(\exp losive\,)} \, + \,Si{F_4}$
$Pb \left( NO _{3}\right)_{2} \stackrel{673 K }{\longrightarrow} A + PbO + O _{2}$
$A \stackrel{\text { Dimerise }}{\longrightarrow} B$
$(I)$ $TeF_6$ $(II)$ $SF_6$ $(III)$ $NCl_3$ $(IV)$ $NF_3$
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