Which one is not tetrahedral ?

1.	Which one is not tetrahedral ?
Answer» `BF_(4)^(-)` `NH_(4)^(+)` `CO_(3)^(2-)` `SO_(4)^(2-)` Solution :`CO_(3)^(2-)` `CO_(3)^(2-)` is `AB_(3)` While `BF_(4)^(-) , NH_(4)^(+) and SO_(4)^(2-)` all three are `AB_(4)` type TETRAHEDRAL and POSSESS `sp^(3)` hybridization .

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