The number of molecules/ions that show linear geometry among the following is
${\rm{S}}{{\rm{O}}_2},{\rm{BeC}}{{\rm{l}}_2},{\rm{C}}{{\rm{O}}_2},\;{\rm{N}}_3^ - ,{\rm{N}}{{\rm{O}}_2},\;{{\rm{F}}_2}{\rm{O}},{\rm{Xe}}{{\rm{F}}_2},{\rm{NO}}_2^ + ,{\rm{I}}_3^ - ,{{\rm{O}}_3}$
