The hybridization of orbitals of N atom in NO3–, NO2+, NH4+ are respectively

In NO3, the central N atom has 3 bonding domains and zero lone pairs of electrons.In NO2, the central N atom has 2 bonding domains and zero lone pairs of electrons.In NH4, the central N atom has 4 bonding domains and zero lone pairs of electrons.The Hybridization of N atom in NO3–, NO2+, NH4+ are sp2, sp, sp3 respectively.