Among the following, the pair in which the two species are not isostructural is

Options

A. `IO_(3)^(-) and XeO_(3)`
B. `PF_(6)^(-) and SF_(6)`
C. `BH_(4)^(-) and NH_(4)^(+)`
D. `CO_(3)^(2-) and NO_(2)^(-)`

Answer

D

Explanation

`IO_(3)^(-),XeO_(3),` (`sp^(3)` hybridisation) pyramidal
`PF_(6)^(-),SF_(6)(sp^(3)d^(2))` octahedral
`BH_(4)^(-),NH_(4)^(+),SiF_(4)(sp^(3))` tetrahedral
`CO_(3)^(2-)(sp^(2))` trigonal planar
`NO_(2)^(-)(sp^(2))` bent (due to the lone pair)
`SF_(4)(sp^(3)d)` square planar
Hence, `CO_(3)^(2-) and NO_(2)^(-)` are not isostructural (same structure).