Among the triatomic molecules/ions, B e C l 2 ,   N 3 - ,   N 2 O ,   N O 2 + ,   O 3 , S C l 2 ,   I C l 2 - ,   I 3 - and X e F 2 , the total number of linear molecule(s)/ion(s) where the hybridization of the central atom does not have contribution from the d-orbital(s) is [Atomic number: S = 16, Cl = 17, I = 53 and Xe = 54]

Step-by-step solution

BeCl 2 ​ ,   N 3 - ,   N 2 O ,   NO 2 + ​ is the linear molecule where the hybridization of the central atom does not have contribution from the d - orbital. In the remaining molecules/ions, O 3 ​ is bent, SCl 2 ​ is V shaped with sp 3   hybridization,   ICl 2 − ,   I 3 - and XeF 2 ​, are linear with sp 3 d hybridization.