Question

Which of the following is not tetrahedral?

• A. $B{F}_4^{-}$
• B. $N{H}_4^{+}$
• C. $C{O}_3^{2-}$
• D. $S{O}_4^{2-}$

Answer 1

Answer: (C)

In $C{O}_3^{2-}$ ion, the C-atom undergoes sp ${}^2$ hybridisation. It has triangular planar structure while $B{F}_4^{-},N{H}_4^{+},S{O}_4^{2-}$ have tetrahedral structure.