In which of the following pairs of molecules/ ions, the central atoms have sp^(2) hybridization ?

In which of the following pairs of molecules/ ions, the central atoms

1.	In which of the following pairs of molecules/ ions, the central atoms have sp^(2) hybridization ?
Answer» `NO_(2)^(-) and NH_(3)` `BF_(3) and NO_(2)^(-)` `NH_(2)^(-) and H_(2)O` `BF_(3) and NH_(2)^(-)` Solution :`BF_(3) and NO_(2)^(-)` `BF_(3) : (3 + 3)/(2) = 3 " means " sp^(2) ` `NO_(2)^(-) : (5 + 1)/(2) = 3 " means " sp^(2)`