Which of the following is not tetrahedral?

Options

A. `BF_(4)^(-)`
B. `NH_(4)^(+)`
C. `CO_(3)^(2-)`
D. `SO_(4)^(2-)`

Answer

C

Explanation

In `CO_(3)^(2-)` ion, the C atom undergoes `sp^(2)`. Hybridisation. It has triangular planar structure while `BF_(4)^(-),NH_(4)^(+) and SO_(4)^(2-)` have tetrahedral structure.