1.

Among the triatomic molecules/ions BeCl_(2),N_(3)^(-),N_(2)O, NO_(2)^(+), O_(3), SCl_(2), lCl_(2)^(-),l_(3)^(-) and XeF_(2), the total number of linear molecules (s)/ion(s) where the hybridisation of the central atom does not have contribution from the d- orbitals (s) is [atomic number of S=16, Cl=17, I=53 and Xe=54]

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ANSWER :4


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