The types of hybrid orbitals of nitrogen in NO2+ , NO3- and NH4+ respectively are expected to be

The number of orbitals involved in hybridization can be determined by the application of formula:


H = number of orbitals involved in hybridization
V= valence electrons of the central atom
M= number of monovalent atoms linked with the central atom
C = charge on the cation
A = charge on the anion


Thus, for NO2+ H is 2 i.e. sp, for NO3- H is 3 i.e. sp2 and for NH4+ H is 4 i.e. sp3.

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