Which of the following is not tetrahedral?

Which of the following is not tetrahedral?
  1. $\mathrm{BF}_4^{-}$
  2. $\mathrm{NH}_4^{+}$
  3. $\mathrm{CO}_3^{2-}$
  4. $\mathrm{SO}_4^{2-}$

Solution

In $\mathrm{CO}_3^{2-}$ ion the $\mathrm{C}$-atom undergoes $s p^2$-hybridisation. It has triangular planar structure. While $\mathrm{BF}_4^{-}, \mathrm{NH}_4^{+}$and $\mathrm{SO}_4^{2-}$ have tetrahedral structure.

Asked in: AP EAMCET 2007

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