In which of the following molecules/ions BF3, NO$_2^ - $, NH$_2^ - $ and H2O, the central atom is sp2 hybridised?

Question

In which of the following molecules/ions BF₃, NO$_2^ - $, NH$_2^ - $ and H₂O, the central atom is sp² hybridised?

NH$_2^ - $ and H₂O

NO$_2^ - $ and H₂O

BF₃ and NO$_2^ - $

NO$_2^ - $ and NH$_2^ - $

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