NO2+Number of electron pairs = 2Number of bond pairs = 2Number of lone pair = 0So, the species is linear with sp hybridisation.NO3-Number of electron pairs = 3Number of bond pairs = 3Number of lone pair = 0So, the species is trigonal planar with sp2 hybridisation
NH4+Number of electron pairs = 4Number of bond pairs = 4Number of lone pair = 0So, the species is tetrahedral with sp3 hybridisation.