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Q.
Which of the following is not tetrahedral?
ManipalManipal 2012Chemical Bonding and Molecular Structure
Solution:
In $CO _{3}^{2-}$ ion, the C-atom undergoes sp $^{2}$ hybridisation. It has triangular planar structure while $BF _{4}^{-}, NH _{4}^{+}, SO _{4}^{2-}$ have tetrahedral structure.