1.

Amongst the following, the molecule/ion that is linear is:

Answer»

`SO_(2)`
`CO_(2)`
`CkO_(2)^(-)`
`NO_(2)^(-)`

Solution :Molecule or ion having sp hybridisation and no LONE pair of ELECTRONS is linear.
Hybridisation = `(1)/(2)` [No. of e in valence shell of central atom + No: monovalent atoms + Charge on anion - Charge on cation]
(a) `SO_(2)`
`H=(1)/(2)(6+0+0-0)=3sp^(2)` (linear shape)
(B) `CO_(2)`
`H=(1)/(2)(4+0+0-0)=2sp` (linear shape)
`CiO_(2)`
`H=(1)/(2)(7+0+1-0)-4sp^(3)` (tetrahedral)
`(d) NO_(2)^(-)`
`H=(1)/(2)(5+0+1-0)=3sp^(3)` (trigonal planar)
`:. CO_(2)` has linear shape.


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