In which of the following molecules/ions BF3, NO2-,NH2- and H20, the central atom is sp2 hybridised?

Q. In which of the following molecules/ions BF3, NO2-,NH2- and H20, the central atom is sp2 hybridised?

1. NO2- and NH2
2. NH2- and H20 
3. NO2- and H20
4. BF3 and NO2-

Answer: BF3 and NO2-